1 /* 2 * Digital Audio (PCM) abstract layer 3 * Copyright (c) by Jaroslav Kysela <perex@perex.cz> 4 * 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License as published by 8 * the Free Software Foundation; either version 2 of the License, or 9 * (at your option) any later version. 10 * 11 * This program is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 * GNU General Public License for more details. 15 * 16 * You should have received a copy of the GNU General Public License 17 * along with this program; if not, write to the Free Software 18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 19 * 20 */ 21 22 #include <linux/mm.h> 23 #include <linux/file.h> 24 #include <linux/slab.h> 25 #include <linux/smp_lock.h> 26 #include <linux/time.h> 27 #include <linux/pm_qos_params.h> 28 #include <linux/uio.h> 29 #include <sound/core.h> 30 #include <sound/control.h> 31 #include <sound/info.h> 32 #include <sound/pcm.h> 33 #include <sound/pcm_params.h> 34 #include <sound/timer.h> 35 #include <sound/minors.h> 36 #include <asm/io.h> 37 38 /* 39 * Compatibility 40 */ 41 42 struct snd_pcm_hw_params_old { 43 unsigned int flags; 44 unsigned int masks[SNDRV_PCM_HW_PARAM_SUBFORMAT - 45 SNDRV_PCM_HW_PARAM_ACCESS + 1]; 46 struct snd_interval intervals[SNDRV_PCM_HW_PARAM_TICK_TIME - 47 SNDRV_PCM_HW_PARAM_SAMPLE_BITS + 1]; 48 unsigned int rmask; 49 unsigned int cmask; 50 unsigned int info; 51 unsigned int msbits; 52 unsigned int rate_num; 53 unsigned int rate_den; 54 snd_pcm_uframes_t fifo_size; 55 unsigned char reserved[64]; 56 }; 57 58 #ifdef CONFIG_SND_SUPPORT_OLD_API 59 #define SNDRV_PCM_IOCTL_HW_REFINE_OLD _IOWR('A', 0x10, struct snd_pcm_hw_params_old) 60 #define SNDRV_PCM_IOCTL_HW_PARAMS_OLD _IOWR('A', 0x11, struct snd_pcm_hw_params_old) 61 62 static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream, 63 struct snd_pcm_hw_params_old __user * _oparams); 64 static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream, 65 struct snd_pcm_hw_params_old __user * _oparams); 66 #endif 67 static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream); 68 69 /* 70 * 71 */ 72 73 DEFINE_RWLOCK(snd_pcm_link_rwlock); 74 EXPORT_SYMBOL(snd_pcm_link_rwlock); 75 76 static DECLARE_RWSEM(snd_pcm_link_rwsem); 77 78 static inline mm_segment_t snd_enter_user(void) 79 { 80 mm_segment_t fs = get_fs(); 81 set_fs(get_ds()); 82 return fs; 83 } 84 85 static inline void snd_leave_user(mm_segment_t fs) 86 { 87 set_fs(fs); 88 } 89 90 91 92 int snd_pcm_info(struct snd_pcm_substream *substream, struct snd_pcm_info *info) 93 { 94 struct snd_pcm_runtime *runtime; 95 struct snd_pcm *pcm = substream->pcm; 96 struct snd_pcm_str *pstr = substream->pstr; 97 98 memset(info, 0, sizeof(*info)); 99 info->card = pcm->card->number; 100 info->device = pcm->device; 101 info->stream = substream->stream; 102 info->subdevice = substream->number; 103 strlcpy(info->id, pcm->id, sizeof(info->id)); 104 strlcpy(info->name, pcm->name, sizeof(info->name)); 105 info->dev_class = pcm->dev_class; 106 info->dev_subclass = pcm->dev_subclass; 107 info->subdevices_count = pstr->substream_count; 108 info->subdevices_avail = pstr->substream_count - pstr->substream_opened; 109 strlcpy(info->subname, substream->name, sizeof(info->subname)); 110 runtime = substream->runtime; 111 /* AB: FIXME!!! This is definitely nonsense */ 112 if (runtime) { 113 info->sync = runtime->sync; 114 substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_INFO, info); 115 } 116 return 0; 117 } 118 119 int snd_pcm_info_user(struct snd_pcm_substream *substream, 120 struct snd_pcm_info __user * _info) 121 { 122 struct snd_pcm_info *info; 123 int err; 124 125 info = kmalloc(sizeof(*info), GFP_KERNEL); 126 if (! info) 127 return -ENOMEM; 128 err = snd_pcm_info(substream, info); 129 if (err >= 0) { 130 if (copy_to_user(_info, info, sizeof(*info))) 131 err = -EFAULT; 132 } 133 kfree(info); 134 return err; 135 } 136 137 #undef RULES_DEBUG 138 139 #ifdef RULES_DEBUG 140 #define HW_PARAM(v) [SNDRV_PCM_HW_PARAM_##v] = #v 141 char *snd_pcm_hw_param_names[] = { 142 HW_PARAM(ACCESS), 143 HW_PARAM(FORMAT), 144 HW_PARAM(SUBFORMAT), 145 HW_PARAM(SAMPLE_BITS), 146 HW_PARAM(FRAME_BITS), 147 HW_PARAM(CHANNELS), 148 HW_PARAM(RATE), 149 HW_PARAM(PERIOD_TIME), 150 HW_PARAM(PERIOD_SIZE), 151 HW_PARAM(PERIOD_BYTES), 152 HW_PARAM(PERIODS), 153 HW_PARAM(BUFFER_TIME), 154 HW_PARAM(BUFFER_SIZE), 155 HW_PARAM(BUFFER_BYTES), 156 HW_PARAM(TICK_TIME), 157 }; 158 #endif 159 160 int snd_pcm_hw_refine(struct snd_pcm_substream *substream, 161 struct snd_pcm_hw_params *params) 162 { 163 unsigned int k; 164 struct snd_pcm_hardware *hw; 165 struct snd_interval *i = NULL; 166 struct snd_mask *m = NULL; 167 struct snd_pcm_hw_constraints *constrs = &substream->runtime->hw_constraints; 168 unsigned int rstamps[constrs->rules_num]; 169 unsigned int vstamps[SNDRV_PCM_HW_PARAM_LAST_INTERVAL + 1]; 170 unsigned int stamp = 2; 171 int changed, again; 172 173 params->info = 0; 174 params->fifo_size = 0; 175 if (params->rmask & (1 << SNDRV_PCM_HW_PARAM_SAMPLE_BITS)) 176 params->msbits = 0; 177 if (params->rmask & (1 << SNDRV_PCM_HW_PARAM_RATE)) { 178 params->rate_num = 0; 179 params->rate_den = 0; 180 } 181 182 for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) { 183 m = hw_param_mask(params, k); 184 if (snd_mask_empty(m)) 185 return -EINVAL; 186 if (!(params->rmask & (1 << k))) 187 continue; 188 #ifdef RULES_DEBUG 189 printk(KERN_DEBUG "%s = ", snd_pcm_hw_param_names[k]); 190 printk("%04x%04x%04x%04x -> ", m->bits[3], m->bits[2], m->bits[1], m->bits[0]); 191 #endif 192 changed = snd_mask_refine(m, constrs_mask(constrs, k)); 193 #ifdef RULES_DEBUG 194 printk("%04x%04x%04x%04x\n", m->bits[3], m->bits[2], m->bits[1], m->bits[0]); 195 #endif 196 if (changed) 197 params->cmask |= 1 << k; 198 if (changed < 0) 199 return changed; 200 } 201 202 for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) { 203 i = hw_param_interval(params, k); 204 if (snd_interval_empty(i)) 205 return -EINVAL; 206 if (!(params->rmask & (1 << k))) 207 continue; 208 #ifdef RULES_DEBUG 209 printk(KERN_DEBUG "%s = ", snd_pcm_hw_param_names[k]); 210 if (i->empty) 211 printk("empty"); 212 else 213 printk("%c%u %u%c", 214 i->openmin ? '(' : '[', i->min, 215 i->max, i->openmax ? ')' : ']'); 216 printk(" -> "); 217 #endif 218 changed = snd_interval_refine(i, constrs_interval(constrs, k)); 219 #ifdef RULES_DEBUG 220 if (i->empty) 221 printk("empty\n"); 222 else 223 printk("%c%u %u%c\n", 224 i->openmin ? '(' : '[', i->min, 225 i->max, i->openmax ? ')' : ']'); 226 #endif 227 if (changed) 228 params->cmask |= 1 << k; 229 if (changed < 0) 230 return changed; 231 } 232 233 for (k = 0; k < constrs->rules_num; k++) 234 rstamps[k] = 0; 235 for (k = 0; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) 236 vstamps[k] = (params->rmask & (1 << k)) ? 1 : 0; 237 do { 238 again = 0; 239 for (k = 0; k < constrs->rules_num; k++) { 240 struct snd_pcm_hw_rule *r = &constrs->rules[k]; 241 unsigned int d; 242 int doit = 0; 243 if (r->cond && !(r->cond & params->flags)) 244 continue; 245 for (d = 0; r->deps[d] >= 0; d++) { 246 if (vstamps[r->deps[d]] > rstamps[k]) { 247 doit = 1; 248 break; 249 } 250 } 251 if (!doit) 252 continue; 253 #ifdef RULES_DEBUG 254 printk(KERN_DEBUG "Rule %d [%p]: ", k, r->func); 255 if (r->var >= 0) { 256 printk("%s = ", snd_pcm_hw_param_names[r->var]); 257 if (hw_is_mask(r->var)) { 258 m = hw_param_mask(params, r->var); 259 printk("%x", *m->bits); 260 } else { 261 i = hw_param_interval(params, r->var); 262 if (i->empty) 263 printk("empty"); 264 else 265 printk("%c%u %u%c", 266 i->openmin ? '(' : '[', i->min, 267 i->max, i->openmax ? ')' : ']'); 268 } 269 } 270 #endif 271 changed = r->func(params, r); 272 #ifdef RULES_DEBUG 273 if (r->var >= 0) { 274 printk(" -> "); 275 if (hw_is_mask(r->var)) 276 printk("%x", *m->bits); 277 else { 278 if (i->empty) 279 printk("empty"); 280 else 281 printk("%c%u %u%c", 282 i->openmin ? '(' : '[', i->min, 283 i->max, i->openmax ? ')' : ']'); 284 } 285 } 286 printk("\n"); 287 #endif 288 rstamps[k] = stamp; 289 if (changed && r->var >= 0) { 290 params->cmask |= (1 << r->var); 291 vstamps[r->var] = stamp; 292 again = 1; 293 } 294 if (changed < 0) 295 return changed; 296 stamp++; 297 } 298 } while (again); 299 if (!params->msbits) { 300 i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_SAMPLE_BITS); 301 if (snd_interval_single(i)) 302 params->msbits = snd_interval_value(i); 303 } 304 305 if (!params->rate_den) { 306 i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE); 307 if (snd_interval_single(i)) { 308 params->rate_num = snd_interval_value(i); 309 params->rate_den = 1; 310 } 311 } 312 313 hw = &substream->runtime->hw; 314 if (!params->info) 315 params->info = hw->info & ~SNDRV_PCM_INFO_FIFO_IN_FRAMES; 316 if (!params->fifo_size) { 317 if (snd_mask_min(¶ms->masks[SNDRV_PCM_HW_PARAM_FORMAT]) == 318 snd_mask_max(¶ms->masks[SNDRV_PCM_HW_PARAM_FORMAT]) && 319 snd_mask_min(¶ms->masks[SNDRV_PCM_HW_PARAM_CHANNELS]) == 320 snd_mask_max(¶ms->masks[SNDRV_PCM_HW_PARAM_CHANNELS])) { 321 changed = substream->ops->ioctl(substream, 322 SNDRV_PCM_IOCTL1_FIFO_SIZE, params); 323 if (changed < 0) 324 return changed; 325 } 326 } 327 params->rmask = 0; 328 return 0; 329 } 330 331 EXPORT_SYMBOL(snd_pcm_hw_refine); 332 333 static int snd_pcm_hw_refine_user(struct snd_pcm_substream *substream, 334 struct snd_pcm_hw_params __user * _params) 335 { 336 struct snd_pcm_hw_params *params; 337 int err; 338 339 params = memdup_user(_params, sizeof(*params)); 340 if (IS_ERR(params)) 341 return PTR_ERR(params); 342 343 err = snd_pcm_hw_refine(substream, params); 344 if (copy_to_user(_params, params, sizeof(*params))) { 345 if (!err) 346 err = -EFAULT; 347 } 348 349 kfree(params); 350 return err; 351 } 352 353 static int period_to_usecs(struct snd_pcm_runtime *runtime) 354 { 355 int usecs; 356 357 if (! runtime->rate) 358 return -1; /* invalid */ 359 360 /* take 75% of period time as the deadline */ 361 usecs = (750000 / runtime->rate) * runtime->period_size; 362 usecs += ((750000 % runtime->rate) * runtime->period_size) / 363 runtime->rate; 364 365 return usecs; 366 } 367 368 static int snd_pcm_hw_params(struct snd_pcm_substream *substream, 369 struct snd_pcm_hw_params *params) 370 { 371 struct snd_pcm_runtime *runtime; 372 int err, usecs; 373 unsigned int bits; 374 snd_pcm_uframes_t frames; 375 376 if (PCM_RUNTIME_CHECK(substream)) 377 return -ENXIO; 378 runtime = substream->runtime; 379 snd_pcm_stream_lock_irq(substream); 380 switch (runtime->status->state) { 381 case SNDRV_PCM_STATE_OPEN: 382 case SNDRV_PCM_STATE_SETUP: 383 case SNDRV_PCM_STATE_PREPARED: 384 break; 385 default: 386 snd_pcm_stream_unlock_irq(substream); 387 return -EBADFD; 388 } 389 snd_pcm_stream_unlock_irq(substream); 390 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE) 391 if (!substream->oss.oss) 392 #endif 393 if (atomic_read(&substream->mmap_count)) 394 return -EBADFD; 395 396 params->rmask = ~0U; 397 err = snd_pcm_hw_refine(substream, params); 398 if (err < 0) 399 goto _error; 400 401 err = snd_pcm_hw_params_choose(substream, params); 402 if (err < 0) 403 goto _error; 404 405 if (substream->ops->hw_params != NULL) { 406 err = substream->ops->hw_params(substream, params); 407 if (err < 0) 408 goto _error; 409 } 410 411 runtime->access = params_access(params); 412 runtime->format = params_format(params); 413 runtime->subformat = params_subformat(params); 414 runtime->channels = params_channels(params); 415 runtime->rate = params_rate(params); 416 runtime->period_size = params_period_size(params); 417 runtime->periods = params_periods(params); 418 runtime->buffer_size = params_buffer_size(params); 419 runtime->info = params->info; 420 runtime->rate_num = params->rate_num; 421 runtime->rate_den = params->rate_den; 422 423 bits = snd_pcm_format_physical_width(runtime->format); 424 runtime->sample_bits = bits; 425 bits *= runtime->channels; 426 runtime->frame_bits = bits; 427 frames = 1; 428 while (bits % 8 != 0) { 429 bits *= 2; 430 frames *= 2; 431 } 432 runtime->byte_align = bits / 8; 433 runtime->min_align = frames; 434 435 /* Default sw params */ 436 runtime->tstamp_mode = SNDRV_PCM_TSTAMP_NONE; 437 runtime->period_step = 1; 438 runtime->control->avail_min = runtime->period_size; 439 runtime->start_threshold = 1; 440 runtime->stop_threshold = runtime->buffer_size; 441 runtime->silence_threshold = 0; 442 runtime->silence_size = 0; 443 runtime->boundary = runtime->buffer_size; 444 while (runtime->boundary * 2 <= LONG_MAX - runtime->buffer_size) 445 runtime->boundary *= 2; 446 447 snd_pcm_timer_resolution_change(substream); 448 runtime->status->state = SNDRV_PCM_STATE_SETUP; 449 450 pm_qos_remove_requirement(PM_QOS_CPU_DMA_LATENCY, 451 substream->latency_id); 452 if ((usecs = period_to_usecs(runtime)) >= 0) 453 pm_qos_add_requirement(PM_QOS_CPU_DMA_LATENCY, 454 substream->latency_id, usecs); 455 return 0; 456 _error: 457 /* hardware might be unuseable from this time, 458 so we force application to retry to set 459 the correct hardware parameter settings */ 460 runtime->status->state = SNDRV_PCM_STATE_OPEN; 461 if (substream->ops->hw_free != NULL) 462 substream->ops->hw_free(substream); 463 return err; 464 } 465 466 static int snd_pcm_hw_params_user(struct snd_pcm_substream *substream, 467 struct snd_pcm_hw_params __user * _params) 468 { 469 struct snd_pcm_hw_params *params; 470 int err; 471 472 params = memdup_user(_params, sizeof(*params)); 473 if (IS_ERR(params)) 474 return PTR_ERR(params); 475 476 err = snd_pcm_hw_params(substream, params); 477 if (copy_to_user(_params, params, sizeof(*params))) { 478 if (!err) 479 err = -EFAULT; 480 } 481 482 kfree(params); 483 return err; 484 } 485 486 static int snd_pcm_hw_free(struct snd_pcm_substream *substream) 487 { 488 struct snd_pcm_runtime *runtime; 489 int result = 0; 490 491 if (PCM_RUNTIME_CHECK(substream)) 492 return -ENXIO; 493 runtime = substream->runtime; 494 snd_pcm_stream_lock_irq(substream); 495 switch (runtime->status->state) { 496 case SNDRV_PCM_STATE_SETUP: 497 case SNDRV_PCM_STATE_PREPARED: 498 break; 499 default: 500 snd_pcm_stream_unlock_irq(substream); 501 return -EBADFD; 502 } 503 snd_pcm_stream_unlock_irq(substream); 504 if (atomic_read(&substream->mmap_count)) 505 return -EBADFD; 506 if (substream->ops->hw_free) 507 result = substream->ops->hw_free(substream); 508 runtime->status->state = SNDRV_PCM_STATE_OPEN; 509 pm_qos_remove_requirement(PM_QOS_CPU_DMA_LATENCY, 510 substream->latency_id); 511 return result; 512 } 513 514 static int snd_pcm_sw_params(struct snd_pcm_substream *substream, 515 struct snd_pcm_sw_params *params) 516 { 517 struct snd_pcm_runtime *runtime; 518 519 if (PCM_RUNTIME_CHECK(substream)) 520 return -ENXIO; 521 runtime = substream->runtime; 522 snd_pcm_stream_lock_irq(substream); 523 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) { 524 snd_pcm_stream_unlock_irq(substream); 525 return -EBADFD; 526 } 527 snd_pcm_stream_unlock_irq(substream); 528 529 if (params->tstamp_mode > SNDRV_PCM_TSTAMP_LAST) 530 return -EINVAL; 531 if (params->avail_min == 0) 532 return -EINVAL; 533 if (params->silence_size >= runtime->boundary) { 534 if (params->silence_threshold != 0) 535 return -EINVAL; 536 } else { 537 if (params->silence_size > params->silence_threshold) 538 return -EINVAL; 539 if (params->silence_threshold > runtime->buffer_size) 540 return -EINVAL; 541 } 542 snd_pcm_stream_lock_irq(substream); 543 runtime->tstamp_mode = params->tstamp_mode; 544 runtime->period_step = params->period_step; 545 runtime->control->avail_min = params->avail_min; 546 runtime->start_threshold = params->start_threshold; 547 runtime->stop_threshold = params->stop_threshold; 548 runtime->silence_threshold = params->silence_threshold; 549 runtime->silence_size = params->silence_size; 550 params->boundary = runtime->boundary; 551 if (snd_pcm_running(substream)) { 552 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK && 553 runtime->silence_size > 0) 554 snd_pcm_playback_silence(substream, ULONG_MAX); 555 wake_up(&runtime->sleep); 556 } 557 snd_pcm_stream_unlock_irq(substream); 558 return 0; 559 } 560 561 static int snd_pcm_sw_params_user(struct snd_pcm_substream *substream, 562 struct snd_pcm_sw_params __user * _params) 563 { 564 struct snd_pcm_sw_params params; 565 int err; 566 if (copy_from_user(¶ms, _params, sizeof(params))) 567 return -EFAULT; 568 err = snd_pcm_sw_params(substream, ¶ms); 569 if (copy_to_user(_params, ¶ms, sizeof(params))) 570 return -EFAULT; 571 return err; 572 } 573 574 int snd_pcm_status(struct snd_pcm_substream *substream, 575 struct snd_pcm_status *status) 576 { 577 struct snd_pcm_runtime *runtime = substream->runtime; 578 579 snd_pcm_stream_lock_irq(substream); 580 status->state = runtime->status->state; 581 status->suspended_state = runtime->status->suspended_state; 582 if (status->state == SNDRV_PCM_STATE_OPEN) 583 goto _end; 584 status->trigger_tstamp = runtime->trigger_tstamp; 585 if (snd_pcm_running(substream)) { 586 snd_pcm_update_hw_ptr(substream); 587 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) { 588 status->tstamp = runtime->status->tstamp; 589 goto _tstamp_end; 590 } 591 } 592 snd_pcm_gettime(runtime, &status->tstamp); 593 _tstamp_end: 594 status->appl_ptr = runtime->control->appl_ptr; 595 status->hw_ptr = runtime->status->hw_ptr; 596 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { 597 status->avail = snd_pcm_playback_avail(runtime); 598 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING || 599 runtime->status->state == SNDRV_PCM_STATE_DRAINING) { 600 status->delay = runtime->buffer_size - status->avail; 601 status->delay += runtime->delay; 602 } else 603 status->delay = 0; 604 } else { 605 status->avail = snd_pcm_capture_avail(runtime); 606 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING) 607 status->delay = status->avail + runtime->delay; 608 else 609 status->delay = 0; 610 } 611 status->avail_max = runtime->avail_max; 612 status->overrange = runtime->overrange; 613 runtime->avail_max = 0; 614 runtime->overrange = 0; 615 _end: 616 snd_pcm_stream_unlock_irq(substream); 617 return 0; 618 } 619 620 static int snd_pcm_status_user(struct snd_pcm_substream *substream, 621 struct snd_pcm_status __user * _status) 622 { 623 struct snd_pcm_status status; 624 int res; 625 626 memset(&status, 0, sizeof(status)); 627 res = snd_pcm_status(substream, &status); 628 if (res < 0) 629 return res; 630 if (copy_to_user(_status, &status, sizeof(status))) 631 return -EFAULT; 632 return 0; 633 } 634 635 static int snd_pcm_channel_info(struct snd_pcm_substream *substream, 636 struct snd_pcm_channel_info * info) 637 { 638 struct snd_pcm_runtime *runtime; 639 unsigned int channel; 640 641 channel = info->channel; 642 runtime = substream->runtime; 643 snd_pcm_stream_lock_irq(substream); 644 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) { 645 snd_pcm_stream_unlock_irq(substream); 646 return -EBADFD; 647 } 648 snd_pcm_stream_unlock_irq(substream); 649 if (channel >= runtime->channels) 650 return -EINVAL; 651 memset(info, 0, sizeof(*info)); 652 info->channel = channel; 653 return substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_CHANNEL_INFO, info); 654 } 655 656 static int snd_pcm_channel_info_user(struct snd_pcm_substream *substream, 657 struct snd_pcm_channel_info __user * _info) 658 { 659 struct snd_pcm_channel_info info; 660 int res; 661 662 if (copy_from_user(&info, _info, sizeof(info))) 663 return -EFAULT; 664 res = snd_pcm_channel_info(substream, &info); 665 if (res < 0) 666 return res; 667 if (copy_to_user(_info, &info, sizeof(info))) 668 return -EFAULT; 669 return 0; 670 } 671 672 static void snd_pcm_trigger_tstamp(struct snd_pcm_substream *substream) 673 { 674 struct snd_pcm_runtime *runtime = substream->runtime; 675 if (runtime->trigger_master == NULL) 676 return; 677 if (runtime->trigger_master == substream) { 678 snd_pcm_gettime(runtime, &runtime->trigger_tstamp); 679 } else { 680 snd_pcm_trigger_tstamp(runtime->trigger_master); 681 runtime->trigger_tstamp = runtime->trigger_master->runtime->trigger_tstamp; 682 } 683 runtime->trigger_master = NULL; 684 } 685 686 struct action_ops { 687 int (*pre_action)(struct snd_pcm_substream *substream, int state); 688 int (*do_action)(struct snd_pcm_substream *substream, int state); 689 void (*undo_action)(struct snd_pcm_substream *substream, int state); 690 void (*post_action)(struct snd_pcm_substream *substream, int state); 691 }; 692 693 /* 694 * this functions is core for handling of linked stream 695 * Note: the stream state might be changed also on failure 696 * Note2: call with calling stream lock + link lock 697 */ 698 static int snd_pcm_action_group(struct action_ops *ops, 699 struct snd_pcm_substream *substream, 700 int state, int do_lock) 701 { 702 struct snd_pcm_substream *s = NULL; 703 struct snd_pcm_substream *s1; 704 int res = 0; 705 706 snd_pcm_group_for_each_entry(s, substream) { 707 if (do_lock && s != substream) 708 spin_lock_nested(&s->self_group.lock, 709 SINGLE_DEPTH_NESTING); 710 res = ops->pre_action(s, state); 711 if (res < 0) 712 goto _unlock; 713 } 714 snd_pcm_group_for_each_entry(s, substream) { 715 res = ops->do_action(s, state); 716 if (res < 0) { 717 if (ops->undo_action) { 718 snd_pcm_group_for_each_entry(s1, substream) { 719 if (s1 == s) /* failed stream */ 720 break; 721 ops->undo_action(s1, state); 722 } 723 } 724 s = NULL; /* unlock all */ 725 goto _unlock; 726 } 727 } 728 snd_pcm_group_for_each_entry(s, substream) { 729 ops->post_action(s, state); 730 } 731 _unlock: 732 if (do_lock) { 733 /* unlock streams */ 734 snd_pcm_group_for_each_entry(s1, substream) { 735 if (s1 != substream) 736 spin_unlock(&s1->self_group.lock); 737 if (s1 == s) /* end */ 738 break; 739 } 740 } 741 return res; 742 } 743 744 /* 745 * Note: call with stream lock 746 */ 747 static int snd_pcm_action_single(struct action_ops *ops, 748 struct snd_pcm_substream *substream, 749 int state) 750 { 751 int res; 752 753 res = ops->pre_action(substream, state); 754 if (res < 0) 755 return res; 756 res = ops->do_action(substream, state); 757 if (res == 0) 758 ops->post_action(substream, state); 759 else if (ops->undo_action) 760 ops->undo_action(substream, state); 761 return res; 762 } 763 764 /* 765 * Note: call with stream lock 766 */ 767 static int snd_pcm_action(struct action_ops *ops, 768 struct snd_pcm_substream *substream, 769 int state) 770 { 771 int res; 772 773 if (snd_pcm_stream_linked(substream)) { 774 if (!spin_trylock(&substream->group->lock)) { 775 spin_unlock(&substream->self_group.lock); 776 spin_lock(&substream->group->lock); 777 spin_lock(&substream->self_group.lock); 778 } 779 res = snd_pcm_action_group(ops, substream, state, 1); 780 spin_unlock(&substream->group->lock); 781 } else { 782 res = snd_pcm_action_single(ops, substream, state); 783 } 784 return res; 785 } 786 787 /* 788 * Note: don't use any locks before 789 */ 790 static int snd_pcm_action_lock_irq(struct action_ops *ops, 791 struct snd_pcm_substream *substream, 792 int state) 793 { 794 int res; 795 796 read_lock_irq(&snd_pcm_link_rwlock); 797 if (snd_pcm_stream_linked(substream)) { 798 spin_lock(&substream->group->lock); 799 spin_lock(&substream->self_group.lock); 800 res = snd_pcm_action_group(ops, substream, state, 1); 801 spin_unlock(&substream->self_group.lock); 802 spin_unlock(&substream->group->lock); 803 } else { 804 spin_lock(&substream->self_group.lock); 805 res = snd_pcm_action_single(ops, substream, state); 806 spin_unlock(&substream->self_group.lock); 807 } 808 read_unlock_irq(&snd_pcm_link_rwlock); 809 return res; 810 } 811 812 /* 813 */ 814 static int snd_pcm_action_nonatomic(struct action_ops *ops, 815 struct snd_pcm_substream *substream, 816 int state) 817 { 818 int res; 819 820 down_read(&snd_pcm_link_rwsem); 821 if (snd_pcm_stream_linked(substream)) 822 res = snd_pcm_action_group(ops, substream, state, 0); 823 else 824 res = snd_pcm_action_single(ops, substream, state); 825 up_read(&snd_pcm_link_rwsem); 826 return res; 827 } 828 829 /* 830 * start callbacks 831 */ 832 static int snd_pcm_pre_start(struct snd_pcm_substream *substream, int state) 833 { 834 struct snd_pcm_runtime *runtime = substream->runtime; 835 if (runtime->status->state != SNDRV_PCM_STATE_PREPARED) 836 return -EBADFD; 837 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK && 838 !snd_pcm_playback_data(substream)) 839 return -EPIPE; 840 runtime->trigger_master = substream; 841 return 0; 842 } 843 844 static int snd_pcm_do_start(struct snd_pcm_substream *substream, int state) 845 { 846 if (substream->runtime->trigger_master != substream) 847 return 0; 848 return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_START); 849 } 850 851 static void snd_pcm_undo_start(struct snd_pcm_substream *substream, int state) 852 { 853 if (substream->runtime->trigger_master == substream) 854 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP); 855 } 856 857 static void snd_pcm_post_start(struct snd_pcm_substream *substream, int state) 858 { 859 struct snd_pcm_runtime *runtime = substream->runtime; 860 snd_pcm_trigger_tstamp(substream); 861 runtime->hw_ptr_jiffies = jiffies; 862 runtime->status->state = state; 863 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK && 864 runtime->silence_size > 0) 865 snd_pcm_playback_silence(substream, ULONG_MAX); 866 if (substream->timer) 867 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MSTART, 868 &runtime->trigger_tstamp); 869 } 870 871 static struct action_ops snd_pcm_action_start = { 872 .pre_action = snd_pcm_pre_start, 873 .do_action = snd_pcm_do_start, 874 .undo_action = snd_pcm_undo_start, 875 .post_action = snd_pcm_post_start 876 }; 877 878 /** 879 * snd_pcm_start - start all linked streams 880 * @substream: the PCM substream instance 881 */ 882 int snd_pcm_start(struct snd_pcm_substream *substream) 883 { 884 return snd_pcm_action(&snd_pcm_action_start, substream, 885 SNDRV_PCM_STATE_RUNNING); 886 } 887 888 /* 889 * stop callbacks 890 */ 891 static int snd_pcm_pre_stop(struct snd_pcm_substream *substream, int state) 892 { 893 struct snd_pcm_runtime *runtime = substream->runtime; 894 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 895 return -EBADFD; 896 runtime->trigger_master = substream; 897 return 0; 898 } 899 900 static int snd_pcm_do_stop(struct snd_pcm_substream *substream, int state) 901 { 902 if (substream->runtime->trigger_master == substream && 903 snd_pcm_running(substream)) 904 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP); 905 return 0; /* unconditonally stop all substreams */ 906 } 907 908 static void snd_pcm_post_stop(struct snd_pcm_substream *substream, int state) 909 { 910 struct snd_pcm_runtime *runtime = substream->runtime; 911 if (runtime->status->state != state) { 912 snd_pcm_trigger_tstamp(substream); 913 if (substream->timer) 914 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MSTOP, 915 &runtime->trigger_tstamp); 916 runtime->status->state = state; 917 } 918 wake_up(&runtime->sleep); 919 } 920 921 static struct action_ops snd_pcm_action_stop = { 922 .pre_action = snd_pcm_pre_stop, 923 .do_action = snd_pcm_do_stop, 924 .post_action = snd_pcm_post_stop 925 }; 926 927 /** 928 * snd_pcm_stop - try to stop all running streams in the substream group 929 * @substream: the PCM substream instance 930 * @state: PCM state after stopping the stream 931 * 932 * The state of each stream is then changed to the given state unconditionally. 933 */ 934 int snd_pcm_stop(struct snd_pcm_substream *substream, int state) 935 { 936 return snd_pcm_action(&snd_pcm_action_stop, substream, state); 937 } 938 939 EXPORT_SYMBOL(snd_pcm_stop); 940 941 /** 942 * snd_pcm_drain_done - stop the DMA only when the given stream is playback 943 * @substream: the PCM substream 944 * 945 * After stopping, the state is changed to SETUP. 946 * Unlike snd_pcm_stop(), this affects only the given stream. 947 */ 948 int snd_pcm_drain_done(struct snd_pcm_substream *substream) 949 { 950 return snd_pcm_action_single(&snd_pcm_action_stop, substream, 951 SNDRV_PCM_STATE_SETUP); 952 } 953 954 /* 955 * pause callbacks 956 */ 957 static int snd_pcm_pre_pause(struct snd_pcm_substream *substream, int push) 958 { 959 struct snd_pcm_runtime *runtime = substream->runtime; 960 if (!(runtime->info & SNDRV_PCM_INFO_PAUSE)) 961 return -ENOSYS; 962 if (push) { 963 if (runtime->status->state != SNDRV_PCM_STATE_RUNNING) 964 return -EBADFD; 965 } else if (runtime->status->state != SNDRV_PCM_STATE_PAUSED) 966 return -EBADFD; 967 runtime->trigger_master = substream; 968 return 0; 969 } 970 971 static int snd_pcm_do_pause(struct snd_pcm_substream *substream, int push) 972 { 973 if (substream->runtime->trigger_master != substream) 974 return 0; 975 /* The jiffies check in snd_pcm_update_hw_ptr*() is done by 976 * a delta betwen the current jiffies, this gives a large enough 977 * delta, effectively to skip the check once. 978 */ 979 substream->runtime->hw_ptr_jiffies = jiffies - HZ * 1000; 980 return substream->ops->trigger(substream, 981 push ? SNDRV_PCM_TRIGGER_PAUSE_PUSH : 982 SNDRV_PCM_TRIGGER_PAUSE_RELEASE); 983 } 984 985 static void snd_pcm_undo_pause(struct snd_pcm_substream *substream, int push) 986 { 987 if (substream->runtime->trigger_master == substream) 988 substream->ops->trigger(substream, 989 push ? SNDRV_PCM_TRIGGER_PAUSE_RELEASE : 990 SNDRV_PCM_TRIGGER_PAUSE_PUSH); 991 } 992 993 static void snd_pcm_post_pause(struct snd_pcm_substream *substream, int push) 994 { 995 struct snd_pcm_runtime *runtime = substream->runtime; 996 snd_pcm_trigger_tstamp(substream); 997 if (push) { 998 runtime->status->state = SNDRV_PCM_STATE_PAUSED; 999 if (substream->timer) 1000 snd_timer_notify(substream->timer, 1001 SNDRV_TIMER_EVENT_MPAUSE, 1002 &runtime->trigger_tstamp); 1003 wake_up(&runtime->sleep); 1004 } else { 1005 runtime->status->state = SNDRV_PCM_STATE_RUNNING; 1006 if (substream->timer) 1007 snd_timer_notify(substream->timer, 1008 SNDRV_TIMER_EVENT_MCONTINUE, 1009 &runtime->trigger_tstamp); 1010 } 1011 } 1012 1013 static struct action_ops snd_pcm_action_pause = { 1014 .pre_action = snd_pcm_pre_pause, 1015 .do_action = snd_pcm_do_pause, 1016 .undo_action = snd_pcm_undo_pause, 1017 .post_action = snd_pcm_post_pause 1018 }; 1019 1020 /* 1021 * Push/release the pause for all linked streams. 1022 */ 1023 static int snd_pcm_pause(struct snd_pcm_substream *substream, int push) 1024 { 1025 return snd_pcm_action(&snd_pcm_action_pause, substream, push); 1026 } 1027 1028 #ifdef CONFIG_PM 1029 /* suspend */ 1030 1031 static int snd_pcm_pre_suspend(struct snd_pcm_substream *substream, int state) 1032 { 1033 struct snd_pcm_runtime *runtime = substream->runtime; 1034 if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) 1035 return -EBUSY; 1036 runtime->trigger_master = substream; 1037 return 0; 1038 } 1039 1040 static int snd_pcm_do_suspend(struct snd_pcm_substream *substream, int state) 1041 { 1042 struct snd_pcm_runtime *runtime = substream->runtime; 1043 if (runtime->trigger_master != substream) 1044 return 0; 1045 if (! snd_pcm_running(substream)) 1046 return 0; 1047 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND); 1048 return 0; /* suspend unconditionally */ 1049 } 1050 1051 static void snd_pcm_post_suspend(struct snd_pcm_substream *substream, int state) 1052 { 1053 struct snd_pcm_runtime *runtime = substream->runtime; 1054 snd_pcm_trigger_tstamp(substream); 1055 if (substream->timer) 1056 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MSUSPEND, 1057 &runtime->trigger_tstamp); 1058 runtime->status->suspended_state = runtime->status->state; 1059 runtime->status->state = SNDRV_PCM_STATE_SUSPENDED; 1060 wake_up(&runtime->sleep); 1061 } 1062 1063 static struct action_ops snd_pcm_action_suspend = { 1064 .pre_action = snd_pcm_pre_suspend, 1065 .do_action = snd_pcm_do_suspend, 1066 .post_action = snd_pcm_post_suspend 1067 }; 1068 1069 /** 1070 * snd_pcm_suspend - trigger SUSPEND to all linked streams 1071 * @substream: the PCM substream 1072 * 1073 * After this call, all streams are changed to SUSPENDED state. 1074 */ 1075 int snd_pcm_suspend(struct snd_pcm_substream *substream) 1076 { 1077 int err; 1078 unsigned long flags; 1079 1080 if (! substream) 1081 return 0; 1082 1083 snd_pcm_stream_lock_irqsave(substream, flags); 1084 err = snd_pcm_action(&snd_pcm_action_suspend, substream, 0); 1085 snd_pcm_stream_unlock_irqrestore(substream, flags); 1086 return err; 1087 } 1088 1089 EXPORT_SYMBOL(snd_pcm_suspend); 1090 1091 /** 1092 * snd_pcm_suspend_all - trigger SUSPEND to all substreams in the given pcm 1093 * @pcm: the PCM instance 1094 * 1095 * After this call, all streams are changed to SUSPENDED state. 1096 */ 1097 int snd_pcm_suspend_all(struct snd_pcm *pcm) 1098 { 1099 struct snd_pcm_substream *substream; 1100 int stream, err = 0; 1101 1102 if (! pcm) 1103 return 0; 1104 1105 for (stream = 0; stream < 2; stream++) { 1106 for (substream = pcm->streams[stream].substream; 1107 substream; substream = substream->next) { 1108 /* FIXME: the open/close code should lock this as well */ 1109 if (substream->runtime == NULL) 1110 continue; 1111 err = snd_pcm_suspend(substream); 1112 if (err < 0 && err != -EBUSY) 1113 return err; 1114 } 1115 } 1116 return 0; 1117 } 1118 1119 EXPORT_SYMBOL(snd_pcm_suspend_all); 1120 1121 /* resume */ 1122 1123 static int snd_pcm_pre_resume(struct snd_pcm_substream *substream, int state) 1124 { 1125 struct snd_pcm_runtime *runtime = substream->runtime; 1126 if (!(runtime->info & SNDRV_PCM_INFO_RESUME)) 1127 return -ENOSYS; 1128 runtime->trigger_master = substream; 1129 return 0; 1130 } 1131 1132 static int snd_pcm_do_resume(struct snd_pcm_substream *substream, int state) 1133 { 1134 struct snd_pcm_runtime *runtime = substream->runtime; 1135 if (runtime->trigger_master != substream) 1136 return 0; 1137 /* DMA not running previously? */ 1138 if (runtime->status->suspended_state != SNDRV_PCM_STATE_RUNNING && 1139 (runtime->status->suspended_state != SNDRV_PCM_STATE_DRAINING || 1140 substream->stream != SNDRV_PCM_STREAM_PLAYBACK)) 1141 return 0; 1142 return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_RESUME); 1143 } 1144 1145 static void snd_pcm_undo_resume(struct snd_pcm_substream *substream, int state) 1146 { 1147 if (substream->runtime->trigger_master == substream && 1148 snd_pcm_running(substream)) 1149 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND); 1150 } 1151 1152 static void snd_pcm_post_resume(struct snd_pcm_substream *substream, int state) 1153 { 1154 struct snd_pcm_runtime *runtime = substream->runtime; 1155 snd_pcm_trigger_tstamp(substream); 1156 if (substream->timer) 1157 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MRESUME, 1158 &runtime->trigger_tstamp); 1159 runtime->status->state = runtime->status->suspended_state; 1160 } 1161 1162 static struct action_ops snd_pcm_action_resume = { 1163 .pre_action = snd_pcm_pre_resume, 1164 .do_action = snd_pcm_do_resume, 1165 .undo_action = snd_pcm_undo_resume, 1166 .post_action = snd_pcm_post_resume 1167 }; 1168 1169 static int snd_pcm_resume(struct snd_pcm_substream *substream) 1170 { 1171 struct snd_card *card = substream->pcm->card; 1172 int res; 1173 1174 snd_power_lock(card); 1175 if ((res = snd_power_wait(card, SNDRV_CTL_POWER_D0)) >= 0) 1176 res = snd_pcm_action_lock_irq(&snd_pcm_action_resume, substream, 0); 1177 snd_power_unlock(card); 1178 return res; 1179 } 1180 1181 #else 1182 1183 static int snd_pcm_resume(struct snd_pcm_substream *substream) 1184 { 1185 return -ENOSYS; 1186 } 1187 1188 #endif /* CONFIG_PM */ 1189 1190 /* 1191 * xrun ioctl 1192 * 1193 * Change the RUNNING stream(s) to XRUN state. 1194 */ 1195 static int snd_pcm_xrun(struct snd_pcm_substream *substream) 1196 { 1197 struct snd_card *card = substream->pcm->card; 1198 struct snd_pcm_runtime *runtime = substream->runtime; 1199 int result; 1200 1201 snd_power_lock(card); 1202 if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) { 1203 result = snd_power_wait(card, SNDRV_CTL_POWER_D0); 1204 if (result < 0) 1205 goto _unlock; 1206 } 1207 1208 snd_pcm_stream_lock_irq(substream); 1209 switch (runtime->status->state) { 1210 case SNDRV_PCM_STATE_XRUN: 1211 result = 0; /* already there */ 1212 break; 1213 case SNDRV_PCM_STATE_RUNNING: 1214 result = snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN); 1215 break; 1216 default: 1217 result = -EBADFD; 1218 } 1219 snd_pcm_stream_unlock_irq(substream); 1220 _unlock: 1221 snd_power_unlock(card); 1222 return result; 1223 } 1224 1225 /* 1226 * reset ioctl 1227 */ 1228 static int snd_pcm_pre_reset(struct snd_pcm_substream *substream, int state) 1229 { 1230 struct snd_pcm_runtime *runtime = substream->runtime; 1231 switch (runtime->status->state) { 1232 case SNDRV_PCM_STATE_RUNNING: 1233 case SNDRV_PCM_STATE_PREPARED: 1234 case SNDRV_PCM_STATE_PAUSED: 1235 case SNDRV_PCM_STATE_SUSPENDED: 1236 return 0; 1237 default: 1238 return -EBADFD; 1239 } 1240 } 1241 1242 static int snd_pcm_do_reset(struct snd_pcm_substream *substream, int state) 1243 { 1244 struct snd_pcm_runtime *runtime = substream->runtime; 1245 int err = substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_RESET, NULL); 1246 if (err < 0) 1247 return err; 1248 runtime->hw_ptr_base = 0; 1249 runtime->hw_ptr_interrupt = runtime->status->hw_ptr - 1250 runtime->status->hw_ptr % runtime->period_size; 1251 runtime->silence_start = runtime->status->hw_ptr; 1252 runtime->silence_filled = 0; 1253 return 0; 1254 } 1255 1256 static void snd_pcm_post_reset(struct snd_pcm_substream *substream, int state) 1257 { 1258 struct snd_pcm_runtime *runtime = substream->runtime; 1259 runtime->control->appl_ptr = runtime->status->hw_ptr; 1260 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK && 1261 runtime->silence_size > 0) 1262 snd_pcm_playback_silence(substream, ULONG_MAX); 1263 } 1264 1265 static struct action_ops snd_pcm_action_reset = { 1266 .pre_action = snd_pcm_pre_reset, 1267 .do_action = snd_pcm_do_reset, 1268 .post_action = snd_pcm_post_reset 1269 }; 1270 1271 static int snd_pcm_reset(struct snd_pcm_substream *substream) 1272 { 1273 return snd_pcm_action_nonatomic(&snd_pcm_action_reset, substream, 0); 1274 } 1275 1276 /* 1277 * prepare ioctl 1278 */ 1279 /* we use the second argument for updating f_flags */ 1280 static int snd_pcm_pre_prepare(struct snd_pcm_substream *substream, 1281 int f_flags) 1282 { 1283 struct snd_pcm_runtime *runtime = substream->runtime; 1284 if (runtime->status->state == SNDRV_PCM_STATE_OPEN || 1285 runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED) 1286 return -EBADFD; 1287 if (snd_pcm_running(substream)) 1288 return -EBUSY; 1289 substream->f_flags = f_flags; 1290 return 0; 1291 } 1292 1293 static int snd_pcm_do_prepare(struct snd_pcm_substream *substream, int state) 1294 { 1295 int err; 1296 err = substream->ops->prepare(substream); 1297 if (err < 0) 1298 return err; 1299 return snd_pcm_do_reset(substream, 0); 1300 } 1301 1302 static void snd_pcm_post_prepare(struct snd_pcm_substream *substream, int state) 1303 { 1304 struct snd_pcm_runtime *runtime = substream->runtime; 1305 runtime->control->appl_ptr = runtime->status->hw_ptr; 1306 runtime->status->state = SNDRV_PCM_STATE_PREPARED; 1307 } 1308 1309 static struct action_ops snd_pcm_action_prepare = { 1310 .pre_action = snd_pcm_pre_prepare, 1311 .do_action = snd_pcm_do_prepare, 1312 .post_action = snd_pcm_post_prepare 1313 }; 1314 1315 /** 1316 * snd_pcm_prepare - prepare the PCM substream to be triggerable 1317 * @substream: the PCM substream instance 1318 * @file: file to refer f_flags 1319 */ 1320 static int snd_pcm_prepare(struct snd_pcm_substream *substream, 1321 struct file *file) 1322 { 1323 int res; 1324 struct snd_card *card = substream->pcm->card; 1325 int f_flags; 1326 1327 if (file) 1328 f_flags = file->f_flags; 1329 else 1330 f_flags = substream->f_flags; 1331 1332 snd_power_lock(card); 1333 if ((res = snd_power_wait(card, SNDRV_CTL_POWER_D0)) >= 0) 1334 res = snd_pcm_action_nonatomic(&snd_pcm_action_prepare, 1335 substream, f_flags); 1336 snd_power_unlock(card); 1337 return res; 1338 } 1339 1340 /* 1341 * drain ioctl 1342 */ 1343 1344 static int snd_pcm_pre_drain_init(struct snd_pcm_substream *substream, int state) 1345 { 1346 if (substream->f_flags & O_NONBLOCK) 1347 return -EAGAIN; 1348 substream->runtime->trigger_master = substream; 1349 return 0; 1350 } 1351 1352 static int snd_pcm_do_drain_init(struct snd_pcm_substream *substream, int state) 1353 { 1354 struct snd_pcm_runtime *runtime = substream->runtime; 1355 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { 1356 switch (runtime->status->state) { 1357 case SNDRV_PCM_STATE_PREPARED: 1358 /* start playback stream if possible */ 1359 if (! snd_pcm_playback_empty(substream)) { 1360 snd_pcm_do_start(substream, SNDRV_PCM_STATE_DRAINING); 1361 snd_pcm_post_start(substream, SNDRV_PCM_STATE_DRAINING); 1362 } 1363 break; 1364 case SNDRV_PCM_STATE_RUNNING: 1365 runtime->status->state = SNDRV_PCM_STATE_DRAINING; 1366 break; 1367 default: 1368 break; 1369 } 1370 } else { 1371 /* stop running stream */ 1372 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING) { 1373 int new_state = snd_pcm_capture_avail(runtime) > 0 ? 1374 SNDRV_PCM_STATE_DRAINING : SNDRV_PCM_STATE_SETUP; 1375 snd_pcm_do_stop(substream, new_state); 1376 snd_pcm_post_stop(substream, new_state); 1377 } 1378 } 1379 return 0; 1380 } 1381 1382 static void snd_pcm_post_drain_init(struct snd_pcm_substream *substream, int state) 1383 { 1384 } 1385 1386 static struct action_ops snd_pcm_action_drain_init = { 1387 .pre_action = snd_pcm_pre_drain_init, 1388 .do_action = snd_pcm_do_drain_init, 1389 .post_action = snd_pcm_post_drain_init 1390 }; 1391 1392 struct drain_rec { 1393 struct snd_pcm_substream *substream; 1394 wait_queue_t wait; 1395 snd_pcm_uframes_t stop_threshold; 1396 }; 1397 1398 static int snd_pcm_drop(struct snd_pcm_substream *substream); 1399 1400 /* 1401 * Drain the stream(s). 1402 * When the substream is linked, sync until the draining of all playback streams 1403 * is finished. 1404 * After this call, all streams are supposed to be either SETUP or DRAINING 1405 * (capture only) state. 1406 */ 1407 static int snd_pcm_drain(struct snd_pcm_substream *substream) 1408 { 1409 struct snd_card *card; 1410 struct snd_pcm_runtime *runtime; 1411 struct snd_pcm_substream *s; 1412 int result = 0; 1413 int i, num_drecs; 1414 struct drain_rec *drec, drec_tmp, *d; 1415 1416 card = substream->pcm->card; 1417 runtime = substream->runtime; 1418 1419 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 1420 return -EBADFD; 1421 1422 snd_power_lock(card); 1423 if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) { 1424 result = snd_power_wait(card, SNDRV_CTL_POWER_D0); 1425 if (result < 0) { 1426 snd_power_unlock(card); 1427 return result; 1428 } 1429 } 1430 1431 /* allocate temporary record for drain sync */ 1432 down_read(&snd_pcm_link_rwsem); 1433 if (snd_pcm_stream_linked(substream)) { 1434 drec = kmalloc(substream->group->count * sizeof(*drec), GFP_KERNEL); 1435 if (! drec) { 1436 up_read(&snd_pcm_link_rwsem); 1437 snd_power_unlock(card); 1438 return -ENOMEM; 1439 } 1440 } else 1441 drec = &drec_tmp; 1442 1443 /* count only playback streams */ 1444 num_drecs = 0; 1445 snd_pcm_group_for_each_entry(s, substream) { 1446 runtime = s->runtime; 1447 if (s->stream == SNDRV_PCM_STREAM_PLAYBACK) { 1448 d = &drec[num_drecs++]; 1449 d->substream = s; 1450 init_waitqueue_entry(&d->wait, current); 1451 add_wait_queue(&runtime->sleep, &d->wait); 1452 /* stop_threshold fixup to avoid endless loop when 1453 * stop_threshold > buffer_size 1454 */ 1455 d->stop_threshold = runtime->stop_threshold; 1456 if (runtime->stop_threshold > runtime->buffer_size) 1457 runtime->stop_threshold = runtime->buffer_size; 1458 } 1459 } 1460 up_read(&snd_pcm_link_rwsem); 1461 1462 snd_pcm_stream_lock_irq(substream); 1463 /* resume pause */ 1464 if (substream->runtime->status->state == SNDRV_PCM_STATE_PAUSED) 1465 snd_pcm_pause(substream, 0); 1466 1467 /* pre-start/stop - all running streams are changed to DRAINING state */ 1468 result = snd_pcm_action(&snd_pcm_action_drain_init, substream, 0); 1469 if (result < 0) { 1470 snd_pcm_stream_unlock_irq(substream); 1471 goto _error; 1472 } 1473 1474 for (;;) { 1475 long tout; 1476 if (signal_pending(current)) { 1477 result = -ERESTARTSYS; 1478 break; 1479 } 1480 /* all finished? */ 1481 for (i = 0; i < num_drecs; i++) { 1482 runtime = drec[i].substream->runtime; 1483 if (runtime->status->state == SNDRV_PCM_STATE_DRAINING) 1484 break; 1485 } 1486 if (i == num_drecs) 1487 break; /* yes, all drained */ 1488 1489 set_current_state(TASK_INTERRUPTIBLE); 1490 snd_pcm_stream_unlock_irq(substream); 1491 snd_power_unlock(card); 1492 tout = schedule_timeout(10 * HZ); 1493 snd_power_lock(card); 1494 snd_pcm_stream_lock_irq(substream); 1495 if (tout == 0) { 1496 if (substream->runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) 1497 result = -ESTRPIPE; 1498 else { 1499 snd_printd("playback drain error (DMA or IRQ trouble?)\n"); 1500 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP); 1501 result = -EIO; 1502 } 1503 break; 1504 } 1505 } 1506 1507 snd_pcm_stream_unlock_irq(substream); 1508 1509 _error: 1510 for (i = 0; i < num_drecs; i++) { 1511 d = &drec[i]; 1512 runtime = d->substream->runtime; 1513 remove_wait_queue(&runtime->sleep, &d->wait); 1514 runtime->stop_threshold = d->stop_threshold; 1515 } 1516 1517 if (drec != &drec_tmp) 1518 kfree(drec); 1519 snd_power_unlock(card); 1520 1521 return result; 1522 } 1523 1524 /* 1525 * drop ioctl 1526 * 1527 * Immediately put all linked substreams into SETUP state. 1528 */ 1529 static int snd_pcm_drop(struct snd_pcm_substream *substream) 1530 { 1531 struct snd_pcm_runtime *runtime; 1532 struct snd_card *card; 1533 int result = 0; 1534 1535 if (PCM_RUNTIME_CHECK(substream)) 1536 return -ENXIO; 1537 runtime = substream->runtime; 1538 card = substream->pcm->card; 1539 1540 if (runtime->status->state == SNDRV_PCM_STATE_OPEN || 1541 runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED || 1542 runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) 1543 return -EBADFD; 1544 1545 snd_pcm_stream_lock_irq(substream); 1546 /* resume pause */ 1547 if (runtime->status->state == SNDRV_PCM_STATE_PAUSED) 1548 snd_pcm_pause(substream, 0); 1549 1550 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP); 1551 /* runtime->control->appl_ptr = runtime->status->hw_ptr; */ 1552 snd_pcm_stream_unlock_irq(substream); 1553 1554 return result; 1555 } 1556 1557 1558 /* WARNING: Don't forget to fput back the file */ 1559 static struct file *snd_pcm_file_fd(int fd) 1560 { 1561 struct file *file; 1562 struct inode *inode; 1563 unsigned int minor; 1564 1565 file = fget(fd); 1566 if (!file) 1567 return NULL; 1568 inode = file->f_path.dentry->d_inode; 1569 if (!S_ISCHR(inode->i_mode) || 1570 imajor(inode) != snd_major) { 1571 fput(file); 1572 return NULL; 1573 } 1574 minor = iminor(inode); 1575 if (!snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_PLAYBACK) && 1576 !snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_CAPTURE)) { 1577 fput(file); 1578 return NULL; 1579 } 1580 return file; 1581 } 1582 1583 /* 1584 * PCM link handling 1585 */ 1586 static int snd_pcm_link(struct snd_pcm_substream *substream, int fd) 1587 { 1588 int res = 0; 1589 struct file *file; 1590 struct snd_pcm_file *pcm_file; 1591 struct snd_pcm_substream *substream1; 1592 1593 file = snd_pcm_file_fd(fd); 1594 if (!file) 1595 return -EBADFD; 1596 pcm_file = file->private_data; 1597 substream1 = pcm_file->substream; 1598 down_write(&snd_pcm_link_rwsem); 1599 write_lock_irq(&snd_pcm_link_rwlock); 1600 if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN || 1601 substream->runtime->status->state != substream1->runtime->status->state) { 1602 res = -EBADFD; 1603 goto _end; 1604 } 1605 if (snd_pcm_stream_linked(substream1)) { 1606 res = -EALREADY; 1607 goto _end; 1608 } 1609 if (!snd_pcm_stream_linked(substream)) { 1610 substream->group = kmalloc(sizeof(struct snd_pcm_group), GFP_ATOMIC); 1611 if (substream->group == NULL) { 1612 res = -ENOMEM; 1613 goto _end; 1614 } 1615 spin_lock_init(&substream->group->lock); 1616 INIT_LIST_HEAD(&substream->group->substreams); 1617 list_add_tail(&substream->link_list, &substream->group->substreams); 1618 substream->group->count = 1; 1619 } 1620 list_add_tail(&substream1->link_list, &substream->group->substreams); 1621 substream->group->count++; 1622 substream1->group = substream->group; 1623 _end: 1624 write_unlock_irq(&snd_pcm_link_rwlock); 1625 up_write(&snd_pcm_link_rwsem); 1626 fput(file); 1627 return res; 1628 } 1629 1630 static void relink_to_local(struct snd_pcm_substream *substream) 1631 { 1632 substream->group = &substream->self_group; 1633 INIT_LIST_HEAD(&substream->self_group.substreams); 1634 list_add_tail(&substream->link_list, &substream->self_group.substreams); 1635 } 1636 1637 static int snd_pcm_unlink(struct snd_pcm_substream *substream) 1638 { 1639 struct snd_pcm_substream *s; 1640 int res = 0; 1641 1642 down_write(&snd_pcm_link_rwsem); 1643 write_lock_irq(&snd_pcm_link_rwlock); 1644 if (!snd_pcm_stream_linked(substream)) { 1645 res = -EALREADY; 1646 goto _end; 1647 } 1648 list_del(&substream->link_list); 1649 substream->group->count--; 1650 if (substream->group->count == 1) { /* detach the last stream, too */ 1651 snd_pcm_group_for_each_entry(s, substream) { 1652 relink_to_local(s); 1653 break; 1654 } 1655 kfree(substream->group); 1656 } 1657 relink_to_local(substream); 1658 _end: 1659 write_unlock_irq(&snd_pcm_link_rwlock); 1660 up_write(&snd_pcm_link_rwsem); 1661 return res; 1662 } 1663 1664 /* 1665 * hw configurator 1666 */ 1667 static int snd_pcm_hw_rule_mul(struct snd_pcm_hw_params *params, 1668 struct snd_pcm_hw_rule *rule) 1669 { 1670 struct snd_interval t; 1671 snd_interval_mul(hw_param_interval_c(params, rule->deps[0]), 1672 hw_param_interval_c(params, rule->deps[1]), &t); 1673 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 1674 } 1675 1676 static int snd_pcm_hw_rule_div(struct snd_pcm_hw_params *params, 1677 struct snd_pcm_hw_rule *rule) 1678 { 1679 struct snd_interval t; 1680 snd_interval_div(hw_param_interval_c(params, rule->deps[0]), 1681 hw_param_interval_c(params, rule->deps[1]), &t); 1682 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 1683 } 1684 1685 static int snd_pcm_hw_rule_muldivk(struct snd_pcm_hw_params *params, 1686 struct snd_pcm_hw_rule *rule) 1687 { 1688 struct snd_interval t; 1689 snd_interval_muldivk(hw_param_interval_c(params, rule->deps[0]), 1690 hw_param_interval_c(params, rule->deps[1]), 1691 (unsigned long) rule->private, &t); 1692 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 1693 } 1694 1695 static int snd_pcm_hw_rule_mulkdiv(struct snd_pcm_hw_params *params, 1696 struct snd_pcm_hw_rule *rule) 1697 { 1698 struct snd_interval t; 1699 snd_interval_mulkdiv(hw_param_interval_c(params, rule->deps[0]), 1700 (unsigned long) rule->private, 1701 hw_param_interval_c(params, rule->deps[1]), &t); 1702 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 1703 } 1704 1705 static int snd_pcm_hw_rule_format(struct snd_pcm_hw_params *params, 1706 struct snd_pcm_hw_rule *rule) 1707 { 1708 unsigned int k; 1709 struct snd_interval *i = hw_param_interval(params, rule->deps[0]); 1710 struct snd_mask m; 1711 struct snd_mask *mask = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT); 1712 snd_mask_any(&m); 1713 for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) { 1714 int bits; 1715 if (! snd_mask_test(mask, k)) 1716 continue; 1717 bits = snd_pcm_format_physical_width(k); 1718 if (bits <= 0) 1719 continue; /* ignore invalid formats */ 1720 if ((unsigned)bits < i->min || (unsigned)bits > i->max) 1721 snd_mask_reset(&m, k); 1722 } 1723 return snd_mask_refine(mask, &m); 1724 } 1725 1726 static int snd_pcm_hw_rule_sample_bits(struct snd_pcm_hw_params *params, 1727 struct snd_pcm_hw_rule *rule) 1728 { 1729 struct snd_interval t; 1730 unsigned int k; 1731 t.min = UINT_MAX; 1732 t.max = 0; 1733 t.openmin = 0; 1734 t.openmax = 0; 1735 for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) { 1736 int bits; 1737 if (! snd_mask_test(hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT), k)) 1738 continue; 1739 bits = snd_pcm_format_physical_width(k); 1740 if (bits <= 0) 1741 continue; /* ignore invalid formats */ 1742 if (t.min > (unsigned)bits) 1743 t.min = bits; 1744 if (t.max < (unsigned)bits) 1745 t.max = bits; 1746 } 1747 t.integer = 1; 1748 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 1749 } 1750 1751 #if SNDRV_PCM_RATE_5512 != 1 << 0 || SNDRV_PCM_RATE_192000 != 1 << 12 1752 #error "Change this table" 1753 #endif 1754 1755 static unsigned int rates[] = { 5512, 8000, 11025, 16000, 22050, 32000, 44100, 1756 48000, 64000, 88200, 96000, 176400, 192000 }; 1757 1758 const struct snd_pcm_hw_constraint_list snd_pcm_known_rates = { 1759 .count = ARRAY_SIZE(rates), 1760 .list = rates, 1761 }; 1762 1763 static int snd_pcm_hw_rule_rate(struct snd_pcm_hw_params *params, 1764 struct snd_pcm_hw_rule *rule) 1765 { 1766 struct snd_pcm_hardware *hw = rule->private; 1767 return snd_interval_list(hw_param_interval(params, rule->var), 1768 snd_pcm_known_rates.count, 1769 snd_pcm_known_rates.list, hw->rates); 1770 } 1771 1772 static int snd_pcm_hw_rule_buffer_bytes_max(struct snd_pcm_hw_params *params, 1773 struct snd_pcm_hw_rule *rule) 1774 { 1775 struct snd_interval t; 1776 struct snd_pcm_substream *substream = rule->private; 1777 t.min = 0; 1778 t.max = substream->buffer_bytes_max; 1779 t.openmin = 0; 1780 t.openmax = 0; 1781 t.integer = 1; 1782 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 1783 } 1784 1785 int snd_pcm_hw_constraints_init(struct snd_pcm_substream *substream) 1786 { 1787 struct snd_pcm_runtime *runtime = substream->runtime; 1788 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints; 1789 int k, err; 1790 1791 for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) { 1792 snd_mask_any(constrs_mask(constrs, k)); 1793 } 1794 1795 for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) { 1796 snd_interval_any(constrs_interval(constrs, k)); 1797 } 1798 1799 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_CHANNELS)); 1800 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_SIZE)); 1801 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_BYTES)); 1802 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_SAMPLE_BITS)); 1803 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_FRAME_BITS)); 1804 1805 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT, 1806 snd_pcm_hw_rule_format, NULL, 1807 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1); 1808 if (err < 0) 1809 return err; 1810 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, 1811 snd_pcm_hw_rule_sample_bits, NULL, 1812 SNDRV_PCM_HW_PARAM_FORMAT, 1813 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1); 1814 if (err < 0) 1815 return err; 1816 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, 1817 snd_pcm_hw_rule_div, NULL, 1818 SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1); 1819 if (err < 0) 1820 return err; 1821 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS, 1822 snd_pcm_hw_rule_mul, NULL, 1823 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1); 1824 if (err < 0) 1825 return err; 1826 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS, 1827 snd_pcm_hw_rule_mulkdiv, (void*) 8, 1828 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1); 1829 if (err < 0) 1830 return err; 1831 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS, 1832 snd_pcm_hw_rule_mulkdiv, (void*) 8, 1833 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, -1); 1834 if (err < 0) 1835 return err; 1836 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS, 1837 snd_pcm_hw_rule_div, NULL, 1838 SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1); 1839 if (err < 0) 1840 return err; 1841 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, 1842 snd_pcm_hw_rule_mulkdiv, (void*) 1000000, 1843 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_TIME, -1); 1844 if (err < 0) 1845 return err; 1846 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, 1847 snd_pcm_hw_rule_mulkdiv, (void*) 1000000, 1848 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_BUFFER_TIME, -1); 1849 if (err < 0) 1850 return err; 1851 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIODS, 1852 snd_pcm_hw_rule_div, NULL, 1853 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1); 1854 if (err < 0) 1855 return err; 1856 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, 1857 snd_pcm_hw_rule_div, NULL, 1858 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1); 1859 if (err < 0) 1860 return err; 1861 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, 1862 snd_pcm_hw_rule_mulkdiv, (void*) 8, 1863 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1); 1864 if (err < 0) 1865 return err; 1866 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, 1867 snd_pcm_hw_rule_muldivk, (void*) 1000000, 1868 SNDRV_PCM_HW_PARAM_PERIOD_TIME, SNDRV_PCM_HW_PARAM_RATE, -1); 1869 if (err < 0) 1870 return err; 1871 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 1872 snd_pcm_hw_rule_mul, NULL, 1873 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1); 1874 if (err < 0) 1875 return err; 1876 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 1877 snd_pcm_hw_rule_mulkdiv, (void*) 8, 1878 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1); 1879 if (err < 0) 1880 return err; 1881 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 1882 snd_pcm_hw_rule_muldivk, (void*) 1000000, 1883 SNDRV_PCM_HW_PARAM_BUFFER_TIME, SNDRV_PCM_HW_PARAM_RATE, -1); 1884 if (err < 0) 1885 return err; 1886 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 1887 snd_pcm_hw_rule_muldivk, (void*) 8, 1888 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1); 1889 if (err < 0) 1890 return err; 1891 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 1892 snd_pcm_hw_rule_muldivk, (void*) 8, 1893 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1); 1894 if (err < 0) 1895 return err; 1896 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_TIME, 1897 snd_pcm_hw_rule_mulkdiv, (void*) 1000000, 1898 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1); 1899 if (err < 0) 1900 return err; 1901 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_TIME, 1902 snd_pcm_hw_rule_mulkdiv, (void*) 1000000, 1903 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1); 1904 if (err < 0) 1905 return err; 1906 return 0; 1907 } 1908 1909 int snd_pcm_hw_constraints_complete(struct snd_pcm_substream *substream) 1910 { 1911 struct snd_pcm_runtime *runtime = substream->runtime; 1912 struct snd_pcm_hardware *hw = &runtime->hw; 1913 int err; 1914 unsigned int mask = 0; 1915 1916 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED) 1917 mask |= 1 << SNDRV_PCM_ACCESS_RW_INTERLEAVED; 1918 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED) 1919 mask |= 1 << SNDRV_PCM_ACCESS_RW_NONINTERLEAVED; 1920 if (hw->info & SNDRV_PCM_INFO_MMAP) { 1921 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED) 1922 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_INTERLEAVED; 1923 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED) 1924 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED; 1925 if (hw->info & SNDRV_PCM_INFO_COMPLEX) 1926 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_COMPLEX; 1927 } 1928 err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_ACCESS, mask); 1929 if (err < 0) 1930 return err; 1931 1932 err = snd_pcm_hw_constraint_mask64(runtime, SNDRV_PCM_HW_PARAM_FORMAT, hw->formats); 1933 if (err < 0) 1934 return err; 1935 1936 err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_SUBFORMAT, 1 << SNDRV_PCM_SUBFORMAT_STD); 1937 if (err < 0) 1938 return err; 1939 1940 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_CHANNELS, 1941 hw->channels_min, hw->channels_max); 1942 if (err < 0) 1943 return err; 1944 1945 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_RATE, 1946 hw->rate_min, hw->rate_max); 1947 if (err < 0) 1948 return err; 1949 1950 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 1951 hw->period_bytes_min, hw->period_bytes_max); 1952 if (err < 0) 1953 return err; 1954 1955 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIODS, 1956 hw->periods_min, hw->periods_max); 1957 if (err < 0) 1958 return err; 1959 1960 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 1961 hw->period_bytes_min, hw->buffer_bytes_max); 1962 if (err < 0) 1963 return err; 1964 1965 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 1966 snd_pcm_hw_rule_buffer_bytes_max, substream, 1967 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, -1); 1968 if (err < 0) 1969 return err; 1970 1971 /* FIXME: remove */ 1972 if (runtime->dma_bytes) { 1973 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 0, runtime->dma_bytes); 1974 if (err < 0) 1975 return -EINVAL; 1976 } 1977 1978 if (!(hw->rates & (SNDRV_PCM_RATE_KNOT | SNDRV_PCM_RATE_CONTINUOUS))) { 1979 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, 1980 snd_pcm_hw_rule_rate, hw, 1981 SNDRV_PCM_HW_PARAM_RATE, -1); 1982 if (err < 0) 1983 return err; 1984 } 1985 1986 /* FIXME: this belong to lowlevel */ 1987 snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIOD_SIZE); 1988 1989 return 0; 1990 } 1991 1992 static void pcm_release_private(struct snd_pcm_substream *substream) 1993 { 1994 snd_pcm_unlink(substream); 1995 } 1996 1997 void snd_pcm_release_substream(struct snd_pcm_substream *substream) 1998 { 1999 substream->ref_count--; 2000 if (substream->ref_count > 0) 2001 return; 2002 2003 snd_pcm_drop(substream); 2004 if (substream->hw_opened) { 2005 if (substream->ops->hw_free != NULL) 2006 substream->ops->hw_free(substream); 2007 substream->ops->close(substream); 2008 substream->hw_opened = 0; 2009 } 2010 if (substream->pcm_release) { 2011 substream->pcm_release(substream); 2012 substream->pcm_release = NULL; 2013 } 2014 snd_pcm_detach_substream(substream); 2015 } 2016 2017 EXPORT_SYMBOL(snd_pcm_release_substream); 2018 2019 int snd_pcm_open_substream(struct snd_pcm *pcm, int stream, 2020 struct file *file, 2021 struct snd_pcm_substream **rsubstream) 2022 { 2023 struct snd_pcm_substream *substream; 2024 int err; 2025 2026 err = snd_pcm_attach_substream(pcm, stream, file, &substream); 2027 if (err < 0) 2028 return err; 2029 if (substream->ref_count > 1) { 2030 *rsubstream = substream; 2031 return 0; 2032 } 2033 2034 err = snd_pcm_hw_constraints_init(substream); 2035 if (err < 0) { 2036 snd_printd("snd_pcm_hw_constraints_init failed\n"); 2037 goto error; 2038 } 2039 2040 if ((err = substream->ops->open(substream)) < 0) 2041 goto error; 2042 2043 substream->hw_opened = 1; 2044 2045 err = snd_pcm_hw_constraints_complete(substream); 2046 if (err < 0) { 2047 snd_printd("snd_pcm_hw_constraints_complete failed\n"); 2048 goto error; 2049 } 2050 2051 *rsubstream = substream; 2052 return 0; 2053 2054 error: 2055 snd_pcm_release_substream(substream); 2056 return err; 2057 } 2058 2059 EXPORT_SYMBOL(snd_pcm_open_substream); 2060 2061 static int snd_pcm_open_file(struct file *file, 2062 struct snd_pcm *pcm, 2063 int stream, 2064 struct snd_pcm_file **rpcm_file) 2065 { 2066 struct snd_pcm_file *pcm_file; 2067 struct snd_pcm_substream *substream; 2068 struct snd_pcm_str *str; 2069 int err; 2070 2071 if (rpcm_file) 2072 *rpcm_file = NULL; 2073 2074 err = snd_pcm_open_substream(pcm, stream, file, &substream); 2075 if (err < 0) 2076 return err; 2077 2078 pcm_file = kzalloc(sizeof(*pcm_file), GFP_KERNEL); 2079 if (pcm_file == NULL) { 2080 snd_pcm_release_substream(substream); 2081 return -ENOMEM; 2082 } 2083 pcm_file->substream = substream; 2084 if (substream->ref_count == 1) { 2085 str = substream->pstr; 2086 substream->file = pcm_file; 2087 substream->pcm_release = pcm_release_private; 2088 } 2089 file->private_data = pcm_file; 2090 if (rpcm_file) 2091 *rpcm_file = pcm_file; 2092 return 0; 2093 } 2094 2095 static int snd_pcm_playback_open(struct inode *inode, struct file *file) 2096 { 2097 struct snd_pcm *pcm; 2098 2099 pcm = snd_lookup_minor_data(iminor(inode), 2100 SNDRV_DEVICE_TYPE_PCM_PLAYBACK); 2101 return snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_PLAYBACK); 2102 } 2103 2104 static int snd_pcm_capture_open(struct inode *inode, struct file *file) 2105 { 2106 struct snd_pcm *pcm; 2107 2108 pcm = snd_lookup_minor_data(iminor(inode), 2109 SNDRV_DEVICE_TYPE_PCM_CAPTURE); 2110 return snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_CAPTURE); 2111 } 2112 2113 static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream) 2114 { 2115 int err; 2116 struct snd_pcm_file *pcm_file; 2117 wait_queue_t wait; 2118 2119 if (pcm == NULL) { 2120 err = -ENODEV; 2121 goto __error1; 2122 } 2123 err = snd_card_file_add(pcm->card, file); 2124 if (err < 0) 2125 goto __error1; 2126 if (!try_module_get(pcm->card->module)) { 2127 err = -EFAULT; 2128 goto __error2; 2129 } 2130 init_waitqueue_entry(&wait, current); 2131 add_wait_queue(&pcm->open_wait, &wait); 2132 mutex_lock(&pcm->open_mutex); 2133 while (1) { 2134 err = snd_pcm_open_file(file, pcm, stream, &pcm_file); 2135 if (err >= 0) 2136 break; 2137 if (err == -EAGAIN) { 2138 if (file->f_flags & O_NONBLOCK) { 2139 err = -EBUSY; 2140 break; 2141 } 2142 } else 2143 break; 2144 set_current_state(TASK_INTERRUPTIBLE); 2145 mutex_unlock(&pcm->open_mutex); 2146 schedule(); 2147 mutex_lock(&pcm->open_mutex); 2148 if (signal_pending(current)) { 2149 err = -ERESTARTSYS; 2150 break; 2151 } 2152 } 2153 remove_wait_queue(&pcm->open_wait, &wait); 2154 mutex_unlock(&pcm->open_mutex); 2155 if (err < 0) 2156 goto __error; 2157 return err; 2158 2159 __error: 2160 module_put(pcm->card->module); 2161 __error2: 2162 snd_card_file_remove(pcm->card, file); 2163 __error1: 2164 return err; 2165 } 2166 2167 static int snd_pcm_release(struct inode *inode, struct file *file) 2168 { 2169 struct snd_pcm *pcm; 2170 struct snd_pcm_substream *substream; 2171 struct snd_pcm_file *pcm_file; 2172 2173 pcm_file = file->private_data; 2174 substream = pcm_file->substream; 2175 if (snd_BUG_ON(!substream)) 2176 return -ENXIO; 2177 pcm = substream->pcm; 2178 mutex_lock(&pcm->open_mutex); 2179 snd_pcm_release_substream(substream); 2180 kfree(pcm_file); 2181 mutex_unlock(&pcm->open_mutex); 2182 wake_up(&pcm->open_wait); 2183 module_put(pcm->card->module); 2184 snd_card_file_remove(pcm->card, file); 2185 return 0; 2186 } 2187 2188 static snd_pcm_sframes_t snd_pcm_playback_rewind(struct snd_pcm_substream *substream, 2189 snd_pcm_uframes_t frames) 2190 { 2191 struct snd_pcm_runtime *runtime = substream->runtime; 2192 snd_pcm_sframes_t appl_ptr; 2193 snd_pcm_sframes_t ret; 2194 snd_pcm_sframes_t hw_avail; 2195 2196 if (frames == 0) 2197 return 0; 2198 2199 snd_pcm_stream_lock_irq(substream); 2200 switch (runtime->status->state) { 2201 case SNDRV_PCM_STATE_PREPARED: 2202 break; 2203 case SNDRV_PCM_STATE_DRAINING: 2204 case SNDRV_PCM_STATE_RUNNING: 2205 if (snd_pcm_update_hw_ptr(substream) >= 0) 2206 break; 2207 /* Fall through */ 2208 case SNDRV_PCM_STATE_XRUN: 2209 ret = -EPIPE; 2210 goto __end; 2211 default: 2212 ret = -EBADFD; 2213 goto __end; 2214 } 2215 2216 hw_avail = snd_pcm_playback_hw_avail(runtime); 2217 if (hw_avail <= 0) { 2218 ret = 0; 2219 goto __end; 2220 } 2221 if (frames > (snd_pcm_uframes_t)hw_avail) 2222 frames = hw_avail; 2223 appl_ptr = runtime->control->appl_ptr - frames; 2224 if (appl_ptr < 0) 2225 appl_ptr += runtime->boundary; 2226 runtime->control->appl_ptr = appl_ptr; 2227 ret = frames; 2228 __end: 2229 snd_pcm_stream_unlock_irq(substream); 2230 return ret; 2231 } 2232 2233 static snd_pcm_sframes_t snd_pcm_capture_rewind(struct snd_pcm_substream *substream, 2234 snd_pcm_uframes_t frames) 2235 { 2236 struct snd_pcm_runtime *runtime = substream->runtime; 2237 snd_pcm_sframes_t appl_ptr; 2238 snd_pcm_sframes_t ret; 2239 snd_pcm_sframes_t hw_avail; 2240 2241 if (frames == 0) 2242 return 0; 2243 2244 snd_pcm_stream_lock_irq(substream); 2245 switch (runtime->status->state) { 2246 case SNDRV_PCM_STATE_PREPARED: 2247 case SNDRV_PCM_STATE_DRAINING: 2248 break; 2249 case SNDRV_PCM_STATE_RUNNING: 2250 if (snd_pcm_update_hw_ptr(substream) >= 0) 2251 break; 2252 /* Fall through */ 2253 case SNDRV_PCM_STATE_XRUN: 2254 ret = -EPIPE; 2255 goto __end; 2256 default: 2257 ret = -EBADFD; 2258 goto __end; 2259 } 2260 2261 hw_avail = snd_pcm_capture_hw_avail(runtime); 2262 if (hw_avail <= 0) { 2263 ret = 0; 2264 goto __end; 2265 } 2266 if (frames > (snd_pcm_uframes_t)hw_avail) 2267 frames = hw_avail; 2268 appl_ptr = runtime->control->appl_ptr - frames; 2269 if (appl_ptr < 0) 2270 appl_ptr += runtime->boundary; 2271 runtime->control->appl_ptr = appl_ptr; 2272 ret = frames; 2273 __end: 2274 snd_pcm_stream_unlock_irq(substream); 2275 return ret; 2276 } 2277 2278 static snd_pcm_sframes_t snd_pcm_playback_forward(struct snd_pcm_substream *substream, 2279 snd_pcm_uframes_t frames) 2280 { 2281 struct snd_pcm_runtime *runtime = substream->runtime; 2282 snd_pcm_sframes_t appl_ptr; 2283 snd_pcm_sframes_t ret; 2284 snd_pcm_sframes_t avail; 2285 2286 if (frames == 0) 2287 return 0; 2288 2289 snd_pcm_stream_lock_irq(substream); 2290 switch (runtime->status->state) { 2291 case SNDRV_PCM_STATE_PREPARED: 2292 case SNDRV_PCM_STATE_PAUSED: 2293 break; 2294 case SNDRV_PCM_STATE_DRAINING: 2295 case SNDRV_PCM_STATE_RUNNING: 2296 if (snd_pcm_update_hw_ptr(substream) >= 0) 2297 break; 2298 /* Fall through */ 2299 case SNDRV_PCM_STATE_XRUN: 2300 ret = -EPIPE; 2301 goto __end; 2302 default: 2303 ret = -EBADFD; 2304 goto __end; 2305 } 2306 2307 avail = snd_pcm_playback_avail(runtime); 2308 if (avail <= 0) { 2309 ret = 0; 2310 goto __end; 2311 } 2312 if (frames > (snd_pcm_uframes_t)avail) 2313 frames = avail; 2314 appl_ptr = runtime->control->appl_ptr + frames; 2315 if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary) 2316 appl_ptr -= runtime->boundary; 2317 runtime->control->appl_ptr = appl_ptr; 2318 ret = frames; 2319 __end: 2320 snd_pcm_stream_unlock_irq(substream); 2321 return ret; 2322 } 2323 2324 static snd_pcm_sframes_t snd_pcm_capture_forward(struct snd_pcm_substream *substream, 2325 snd_pcm_uframes_t frames) 2326 { 2327 struct snd_pcm_runtime *runtime = substream->runtime; 2328 snd_pcm_sframes_t appl_ptr; 2329 snd_pcm_sframes_t ret; 2330 snd_pcm_sframes_t avail; 2331 2332 if (frames == 0) 2333 return 0; 2334 2335 snd_pcm_stream_lock_irq(substream); 2336 switch (runtime->status->state) { 2337 case SNDRV_PCM_STATE_PREPARED: 2338 case SNDRV_PCM_STATE_DRAINING: 2339 case SNDRV_PCM_STATE_PAUSED: 2340 break; 2341 case SNDRV_PCM_STATE_RUNNING: 2342 if (snd_pcm_update_hw_ptr(substream) >= 0) 2343 break; 2344 /* Fall through */ 2345 case SNDRV_PCM_STATE_XRUN: 2346 ret = -EPIPE; 2347 goto __end; 2348 default: 2349 ret = -EBADFD; 2350 goto __end; 2351 } 2352 2353 avail = snd_pcm_capture_avail(runtime); 2354 if (avail <= 0) { 2355 ret = 0; 2356 goto __end; 2357 } 2358 if (frames > (snd_pcm_uframes_t)avail) 2359 frames = avail; 2360 appl_ptr = runtime->control->appl_ptr + frames; 2361 if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary) 2362 appl_ptr -= runtime->boundary; 2363 runtime->control->appl_ptr = appl_ptr; 2364 ret = frames; 2365 __end: 2366 snd_pcm_stream_unlock_irq(substream); 2367 return ret; 2368 } 2369 2370 static int snd_pcm_hwsync(struct snd_pcm_substream *substream) 2371 { 2372 struct snd_pcm_runtime *runtime = substream->runtime; 2373 int err; 2374 2375 snd_pcm_stream_lock_irq(substream); 2376 switch (runtime->status->state) { 2377 case SNDRV_PCM_STATE_DRAINING: 2378 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) 2379 goto __badfd; 2380 case SNDRV_PCM_STATE_RUNNING: 2381 if ((err = snd_pcm_update_hw_ptr(substream)) < 0) 2382 break; 2383 /* Fall through */ 2384 case SNDRV_PCM_STATE_PREPARED: 2385 case SNDRV_PCM_STATE_SUSPENDED: 2386 err = 0; 2387 break; 2388 case SNDRV_PCM_STATE_XRUN: 2389 err = -EPIPE; 2390 break; 2391 default: 2392 __badfd: 2393 err = -EBADFD; 2394 break; 2395 } 2396 snd_pcm_stream_unlock_irq(substream); 2397 return err; 2398 } 2399 2400 static int snd_pcm_delay(struct snd_pcm_substream *substream, 2401 snd_pcm_sframes_t __user *res) 2402 { 2403 struct snd_pcm_runtime *runtime = substream->runtime; 2404 int err; 2405 snd_pcm_sframes_t n = 0; 2406 2407 snd_pcm_stream_lock_irq(substream); 2408 switch (runtime->status->state) { 2409 case SNDRV_PCM_STATE_DRAINING: 2410 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) 2411 goto __badfd; 2412 case SNDRV_PCM_STATE_RUNNING: 2413 if ((err = snd_pcm_update_hw_ptr(substream)) < 0) 2414 break; 2415 /* Fall through */ 2416 case SNDRV_PCM_STATE_PREPARED: 2417 case SNDRV_PCM_STATE_SUSPENDED: 2418 err = 0; 2419 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) 2420 n = snd_pcm_playback_hw_avail(runtime); 2421 else 2422 n = snd_pcm_capture_avail(runtime); 2423 n += runtime->delay; 2424 break; 2425 case SNDRV_PCM_STATE_XRUN: 2426 err = -EPIPE; 2427 break; 2428 default: 2429 __badfd: 2430 err = -EBADFD; 2431 break; 2432 } 2433 snd_pcm_stream_unlock_irq(substream); 2434 if (!err) 2435 if (put_user(n, res)) 2436 err = -EFAULT; 2437 return err; 2438 } 2439 2440 static int snd_pcm_sync_ptr(struct snd_pcm_substream *substream, 2441 struct snd_pcm_sync_ptr __user *_sync_ptr) 2442 { 2443 struct snd_pcm_runtime *runtime = substream->runtime; 2444 struct snd_pcm_sync_ptr sync_ptr; 2445 volatile struct snd_pcm_mmap_status *status; 2446 volatile struct snd_pcm_mmap_control *control; 2447 int err; 2448 2449 memset(&sync_ptr, 0, sizeof(sync_ptr)); 2450 if (get_user(sync_ptr.flags, (unsigned __user *)&(_sync_ptr->flags))) 2451 return -EFAULT; 2452 if (copy_from_user(&sync_ptr.c.control, &(_sync_ptr->c.control), sizeof(struct snd_pcm_mmap_control))) 2453 return -EFAULT; 2454 status = runtime->status; 2455 control = runtime->control; 2456 if (sync_ptr.flags & SNDRV_PCM_SYNC_PTR_HWSYNC) { 2457 err = snd_pcm_hwsync(substream); 2458 if (err < 0) 2459 return err; 2460 } 2461 snd_pcm_stream_lock_irq(substream); 2462 if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_APPL)) 2463 control->appl_ptr = sync_ptr.c.control.appl_ptr; 2464 else 2465 sync_ptr.c.control.appl_ptr = control->appl_ptr; 2466 if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_AVAIL_MIN)) 2467 control->avail_min = sync_ptr.c.control.avail_min; 2468 else 2469 sync_ptr.c.control.avail_min = control->avail_min; 2470 sync_ptr.s.status.state = status->state; 2471 sync_ptr.s.status.hw_ptr = status->hw_ptr; 2472 sync_ptr.s.status.tstamp = status->tstamp; 2473 sync_ptr.s.status.suspended_state = status->suspended_state; 2474 snd_pcm_stream_unlock_irq(substream); 2475 if (copy_to_user(_sync_ptr, &sync_ptr, sizeof(sync_ptr))) 2476 return -EFAULT; 2477 return 0; 2478 } 2479 2480 static int snd_pcm_tstamp(struct snd_pcm_substream *substream, int __user *_arg) 2481 { 2482 struct snd_pcm_runtime *runtime = substream->runtime; 2483 int arg; 2484 2485 if (get_user(arg, _arg)) 2486 return -EFAULT; 2487 if (arg < 0 || arg > SNDRV_PCM_TSTAMP_TYPE_LAST) 2488 return -EINVAL; 2489 runtime->tstamp_type = SNDRV_PCM_TSTAMP_TYPE_GETTIMEOFDAY; 2490 if (arg == SNDRV_PCM_TSTAMP_TYPE_MONOTONIC) 2491 runtime->tstamp_type = SNDRV_PCM_TSTAMP_TYPE_MONOTONIC; 2492 return 0; 2493 } 2494 2495 static int snd_pcm_common_ioctl1(struct file *file, 2496 struct snd_pcm_substream *substream, 2497 unsigned int cmd, void __user *arg) 2498 { 2499 switch (cmd) { 2500 case SNDRV_PCM_IOCTL_PVERSION: 2501 return put_user(SNDRV_PCM_VERSION, (int __user *)arg) ? -EFAULT : 0; 2502 case SNDRV_PCM_IOCTL_INFO: 2503 return snd_pcm_info_user(substream, arg); 2504 case SNDRV_PCM_IOCTL_TSTAMP: /* just for compatibility */ 2505 return 0; 2506 case SNDRV_PCM_IOCTL_TTSTAMP: 2507 return snd_pcm_tstamp(substream, arg); 2508 case SNDRV_PCM_IOCTL_HW_REFINE: 2509 return snd_pcm_hw_refine_user(substream, arg); 2510 case SNDRV_PCM_IOCTL_HW_PARAMS: 2511 return snd_pcm_hw_params_user(substream, arg); 2512 case SNDRV_PCM_IOCTL_HW_FREE: 2513 return snd_pcm_hw_free(substream); 2514 case SNDRV_PCM_IOCTL_SW_PARAMS: 2515 return snd_pcm_sw_params_user(substream, arg); 2516 case SNDRV_PCM_IOCTL_STATUS: 2517 return snd_pcm_status_user(substream, arg); 2518 case SNDRV_PCM_IOCTL_CHANNEL_INFO: 2519 return snd_pcm_channel_info_user(substream, arg); 2520 case SNDRV_PCM_IOCTL_PREPARE: 2521 return snd_pcm_prepare(substream, file); 2522 case SNDRV_PCM_IOCTL_RESET: 2523 return snd_pcm_reset(substream); 2524 case SNDRV_PCM_IOCTL_START: 2525 return snd_pcm_action_lock_irq(&snd_pcm_action_start, substream, SNDRV_PCM_STATE_RUNNING); 2526 case SNDRV_PCM_IOCTL_LINK: 2527 return snd_pcm_link(substream, (int)(unsigned long) arg); 2528 case SNDRV_PCM_IOCTL_UNLINK: 2529 return snd_pcm_unlink(substream); 2530 case SNDRV_PCM_IOCTL_RESUME: 2531 return snd_pcm_resume(substream); 2532 case SNDRV_PCM_IOCTL_XRUN: 2533 return snd_pcm_xrun(substream); 2534 case SNDRV_PCM_IOCTL_HWSYNC: 2535 return snd_pcm_hwsync(substream); 2536 case SNDRV_PCM_IOCTL_DELAY: 2537 return snd_pcm_delay(substream, arg); 2538 case SNDRV_PCM_IOCTL_SYNC_PTR: 2539 return snd_pcm_sync_ptr(substream, arg); 2540 #ifdef CONFIG_SND_SUPPORT_OLD_API 2541 case SNDRV_PCM_IOCTL_HW_REFINE_OLD: 2542 return snd_pcm_hw_refine_old_user(substream, arg); 2543 case SNDRV_PCM_IOCTL_HW_PARAMS_OLD: 2544 return snd_pcm_hw_params_old_user(substream, arg); 2545 #endif 2546 case SNDRV_PCM_IOCTL_DRAIN: 2547 return snd_pcm_drain(substream); 2548 case SNDRV_PCM_IOCTL_DROP: 2549 return snd_pcm_drop(substream); 2550 case SNDRV_PCM_IOCTL_PAUSE: 2551 { 2552 int res; 2553 snd_pcm_stream_lock_irq(substream); 2554 res = snd_pcm_pause(substream, (int)(unsigned long)arg); 2555 snd_pcm_stream_unlock_irq(substream); 2556 return res; 2557 } 2558 } 2559 snd_printd("unknown ioctl = 0x%x\n", cmd); 2560 return -ENOTTY; 2561 } 2562 2563 static int snd_pcm_playback_ioctl1(struct file *file, 2564 struct snd_pcm_substream *substream, 2565 unsigned int cmd, void __user *arg) 2566 { 2567 if (snd_BUG_ON(!substream)) 2568 return -ENXIO; 2569 if (snd_BUG_ON(substream->stream != SNDRV_PCM_STREAM_PLAYBACK)) 2570 return -EINVAL; 2571 switch (cmd) { 2572 case SNDRV_PCM_IOCTL_WRITEI_FRAMES: 2573 { 2574 struct snd_xferi xferi; 2575 struct snd_xferi __user *_xferi = arg; 2576 struct snd_pcm_runtime *runtime = substream->runtime; 2577 snd_pcm_sframes_t result; 2578 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 2579 return -EBADFD; 2580 if (put_user(0, &_xferi->result)) 2581 return -EFAULT; 2582 if (copy_from_user(&xferi, _xferi, sizeof(xferi))) 2583 return -EFAULT; 2584 result = snd_pcm_lib_write(substream, xferi.buf, xferi.frames); 2585 __put_user(result, &_xferi->result); 2586 return result < 0 ? result : 0; 2587 } 2588 case SNDRV_PCM_IOCTL_WRITEN_FRAMES: 2589 { 2590 struct snd_xfern xfern; 2591 struct snd_xfern __user *_xfern = arg; 2592 struct snd_pcm_runtime *runtime = substream->runtime; 2593 void __user **bufs; 2594 snd_pcm_sframes_t result; 2595 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 2596 return -EBADFD; 2597 if (runtime->channels > 128) 2598 return -EINVAL; 2599 if (put_user(0, &_xfern->result)) 2600 return -EFAULT; 2601 if (copy_from_user(&xfern, _xfern, sizeof(xfern))) 2602 return -EFAULT; 2603 2604 bufs = memdup_user(xfern.bufs, 2605 sizeof(void *) * runtime->channels); 2606 if (IS_ERR(bufs)) 2607 return PTR_ERR(bufs); 2608 result = snd_pcm_lib_writev(substream, bufs, xfern.frames); 2609 kfree(bufs); 2610 __put_user(result, &_xfern->result); 2611 return result < 0 ? result : 0; 2612 } 2613 case SNDRV_PCM_IOCTL_REWIND: 2614 { 2615 snd_pcm_uframes_t frames; 2616 snd_pcm_uframes_t __user *_frames = arg; 2617 snd_pcm_sframes_t result; 2618 if (get_user(frames, _frames)) 2619 return -EFAULT; 2620 if (put_user(0, _frames)) 2621 return -EFAULT; 2622 result = snd_pcm_playback_rewind(substream, frames); 2623 __put_user(result, _frames); 2624 return result < 0 ? result : 0; 2625 } 2626 case SNDRV_PCM_IOCTL_FORWARD: 2627 { 2628 snd_pcm_uframes_t frames; 2629 snd_pcm_uframes_t __user *_frames = arg; 2630 snd_pcm_sframes_t result; 2631 if (get_user(frames, _frames)) 2632 return -EFAULT; 2633 if (put_user(0, _frames)) 2634 return -EFAULT; 2635 result = snd_pcm_playback_forward(substream, frames); 2636 __put_user(result, _frames); 2637 return result < 0 ? result : 0; 2638 } 2639 } 2640 return snd_pcm_common_ioctl1(file, substream, cmd, arg); 2641 } 2642 2643 static int snd_pcm_capture_ioctl1(struct file *file, 2644 struct snd_pcm_substream *substream, 2645 unsigned int cmd, void __user *arg) 2646 { 2647 if (snd_BUG_ON(!substream)) 2648 return -ENXIO; 2649 if (snd_BUG_ON(substream->stream != SNDRV_PCM_STREAM_CAPTURE)) 2650 return -EINVAL; 2651 switch (cmd) { 2652 case SNDRV_PCM_IOCTL_READI_FRAMES: 2653 { 2654 struct snd_xferi xferi; 2655 struct snd_xferi __user *_xferi = arg; 2656 struct snd_pcm_runtime *runtime = substream->runtime; 2657 snd_pcm_sframes_t result; 2658 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 2659 return -EBADFD; 2660 if (put_user(0, &_xferi->result)) 2661 return -EFAULT; 2662 if (copy_from_user(&xferi, _xferi, sizeof(xferi))) 2663 return -EFAULT; 2664 result = snd_pcm_lib_read(substream, xferi.buf, xferi.frames); 2665 __put_user(result, &_xferi->result); 2666 return result < 0 ? result : 0; 2667 } 2668 case SNDRV_PCM_IOCTL_READN_FRAMES: 2669 { 2670 struct snd_xfern xfern; 2671 struct snd_xfern __user *_xfern = arg; 2672 struct snd_pcm_runtime *runtime = substream->runtime; 2673 void *bufs; 2674 snd_pcm_sframes_t result; 2675 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 2676 return -EBADFD; 2677 if (runtime->channels > 128) 2678 return -EINVAL; 2679 if (put_user(0, &_xfern->result)) 2680 return -EFAULT; 2681 if (copy_from_user(&xfern, _xfern, sizeof(xfern))) 2682 return -EFAULT; 2683 2684 bufs = memdup_user(xfern.bufs, 2685 sizeof(void *) * runtime->channels); 2686 if (IS_ERR(bufs)) 2687 return PTR_ERR(bufs); 2688 result = snd_pcm_lib_readv(substream, bufs, xfern.frames); 2689 kfree(bufs); 2690 __put_user(result, &_xfern->result); 2691 return result < 0 ? result : 0; 2692 } 2693 case SNDRV_PCM_IOCTL_REWIND: 2694 { 2695 snd_pcm_uframes_t frames; 2696 snd_pcm_uframes_t __user *_frames = arg; 2697 snd_pcm_sframes_t result; 2698 if (get_user(frames, _frames)) 2699 return -EFAULT; 2700 if (put_user(0, _frames)) 2701 return -EFAULT; 2702 result = snd_pcm_capture_rewind(substream, frames); 2703 __put_user(result, _frames); 2704 return result < 0 ? result : 0; 2705 } 2706 case SNDRV_PCM_IOCTL_FORWARD: 2707 { 2708 snd_pcm_uframes_t frames; 2709 snd_pcm_uframes_t __user *_frames = arg; 2710 snd_pcm_sframes_t result; 2711 if (get_user(frames, _frames)) 2712 return -EFAULT; 2713 if (put_user(0, _frames)) 2714 return -EFAULT; 2715 result = snd_pcm_capture_forward(substream, frames); 2716 __put_user(result, _frames); 2717 return result < 0 ? result : 0; 2718 } 2719 } 2720 return snd_pcm_common_ioctl1(file, substream, cmd, arg); 2721 } 2722 2723 static long snd_pcm_playback_ioctl(struct file *file, unsigned int cmd, 2724 unsigned long arg) 2725 { 2726 struct snd_pcm_file *pcm_file; 2727 2728 pcm_file = file->private_data; 2729 2730 if (((cmd >> 8) & 0xff) != 'A') 2731 return -ENOTTY; 2732 2733 return snd_pcm_playback_ioctl1(file, pcm_file->substream, cmd, 2734 (void __user *)arg); 2735 } 2736 2737 static long snd_pcm_capture_ioctl(struct file *file, unsigned int cmd, 2738 unsigned long arg) 2739 { 2740 struct snd_pcm_file *pcm_file; 2741 2742 pcm_file = file->private_data; 2743 2744 if (((cmd >> 8) & 0xff) != 'A') 2745 return -ENOTTY; 2746 2747 return snd_pcm_capture_ioctl1(file, pcm_file->substream, cmd, 2748 (void __user *)arg); 2749 } 2750 2751 int snd_pcm_kernel_ioctl(struct snd_pcm_substream *substream, 2752 unsigned int cmd, void *arg) 2753 { 2754 mm_segment_t fs; 2755 int result; 2756 2757 fs = snd_enter_user(); 2758 switch (substream->stream) { 2759 case SNDRV_PCM_STREAM_PLAYBACK: 2760 result = snd_pcm_playback_ioctl1(NULL, substream, cmd, 2761 (void __user *)arg); 2762 break; 2763 case SNDRV_PCM_STREAM_CAPTURE: 2764 result = snd_pcm_capture_ioctl1(NULL, substream, cmd, 2765 (void __user *)arg); 2766 break; 2767 default: 2768 result = -EINVAL; 2769 break; 2770 } 2771 snd_leave_user(fs); 2772 return result; 2773 } 2774 2775 EXPORT_SYMBOL(snd_pcm_kernel_ioctl); 2776 2777 static ssize_t snd_pcm_read(struct file *file, char __user *buf, size_t count, 2778 loff_t * offset) 2779 { 2780 struct snd_pcm_file *pcm_file; 2781 struct snd_pcm_substream *substream; 2782 struct snd_pcm_runtime *runtime; 2783 snd_pcm_sframes_t result; 2784 2785 pcm_file = file->private_data; 2786 substream = pcm_file->substream; 2787 if (PCM_RUNTIME_CHECK(substream)) 2788 return -ENXIO; 2789 runtime = substream->runtime; 2790 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 2791 return -EBADFD; 2792 if (!frame_aligned(runtime, count)) 2793 return -EINVAL; 2794 count = bytes_to_frames(runtime, count); 2795 result = snd_pcm_lib_read(substream, buf, count); 2796 if (result > 0) 2797 result = frames_to_bytes(runtime, result); 2798 return result; 2799 } 2800 2801 static ssize_t snd_pcm_write(struct file *file, const char __user *buf, 2802 size_t count, loff_t * offset) 2803 { 2804 struct snd_pcm_file *pcm_file; 2805 struct snd_pcm_substream *substream; 2806 struct snd_pcm_runtime *runtime; 2807 snd_pcm_sframes_t result; 2808 2809 pcm_file = file->private_data; 2810 substream = pcm_file->substream; 2811 if (PCM_RUNTIME_CHECK(substream)) 2812 return -ENXIO; 2813 runtime = substream->runtime; 2814 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 2815 return -EBADFD; 2816 if (!frame_aligned(runtime, count)) 2817 return -EINVAL; 2818 count = bytes_to_frames(runtime, count); 2819 result = snd_pcm_lib_write(substream, buf, count); 2820 if (result > 0) 2821 result = frames_to_bytes(runtime, result); 2822 return result; 2823 } 2824 2825 static ssize_t snd_pcm_aio_read(struct kiocb *iocb, const struct iovec *iov, 2826 unsigned long nr_segs, loff_t pos) 2827 2828 { 2829 struct snd_pcm_file *pcm_file; 2830 struct snd_pcm_substream *substream; 2831 struct snd_pcm_runtime *runtime; 2832 snd_pcm_sframes_t result; 2833 unsigned long i; 2834 void __user **bufs; 2835 snd_pcm_uframes_t frames; 2836 2837 pcm_file = iocb->ki_filp->private_data; 2838 substream = pcm_file->substream; 2839 if (PCM_RUNTIME_CHECK(substream)) 2840 return -ENXIO; 2841 runtime = substream->runtime; 2842 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 2843 return -EBADFD; 2844 if (nr_segs > 1024 || nr_segs != runtime->channels) 2845 return -EINVAL; 2846 if (!frame_aligned(runtime, iov->iov_len)) 2847 return -EINVAL; 2848 frames = bytes_to_samples(runtime, iov->iov_len); 2849 bufs = kmalloc(sizeof(void *) * nr_segs, GFP_KERNEL); 2850 if (bufs == NULL) 2851 return -ENOMEM; 2852 for (i = 0; i < nr_segs; ++i) 2853 bufs[i] = iov[i].iov_base; 2854 result = snd_pcm_lib_readv(substream, bufs, frames); 2855 if (result > 0) 2856 result = frames_to_bytes(runtime, result); 2857 kfree(bufs); 2858 return result; 2859 } 2860 2861 static ssize_t snd_pcm_aio_write(struct kiocb *iocb, const struct iovec *iov, 2862 unsigned long nr_segs, loff_t pos) 2863 { 2864 struct snd_pcm_file *pcm_file; 2865 struct snd_pcm_substream *substream; 2866 struct snd_pcm_runtime *runtime; 2867 snd_pcm_sframes_t result; 2868 unsigned long i; 2869 void __user **bufs; 2870 snd_pcm_uframes_t frames; 2871 2872 pcm_file = iocb->ki_filp->private_data; 2873 substream = pcm_file->substream; 2874 if (PCM_RUNTIME_CHECK(substream)) 2875 return -ENXIO; 2876 runtime = substream->runtime; 2877 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 2878 return -EBADFD; 2879 if (nr_segs > 128 || nr_segs != runtime->channels || 2880 !frame_aligned(runtime, iov->iov_len)) 2881 return -EINVAL; 2882 frames = bytes_to_samples(runtime, iov->iov_len); 2883 bufs = kmalloc(sizeof(void *) * nr_segs, GFP_KERNEL); 2884 if (bufs == NULL) 2885 return -ENOMEM; 2886 for (i = 0; i < nr_segs; ++i) 2887 bufs[i] = iov[i].iov_base; 2888 result = snd_pcm_lib_writev(substream, bufs, frames); 2889 if (result > 0) 2890 result = frames_to_bytes(runtime, result); 2891 kfree(bufs); 2892 return result; 2893 } 2894 2895 static unsigned int snd_pcm_playback_poll(struct file *file, poll_table * wait) 2896 { 2897 struct snd_pcm_file *pcm_file; 2898 struct snd_pcm_substream *substream; 2899 struct snd_pcm_runtime *runtime; 2900 unsigned int mask; 2901 snd_pcm_uframes_t avail; 2902 2903 pcm_file = file->private_data; 2904 2905 substream = pcm_file->substream; 2906 if (PCM_RUNTIME_CHECK(substream)) 2907 return -ENXIO; 2908 runtime = substream->runtime; 2909 2910 poll_wait(file, &runtime->sleep, wait); 2911 2912 snd_pcm_stream_lock_irq(substream); 2913 avail = snd_pcm_playback_avail(runtime); 2914 switch (runtime->status->state) { 2915 case SNDRV_PCM_STATE_RUNNING: 2916 case SNDRV_PCM_STATE_PREPARED: 2917 case SNDRV_PCM_STATE_PAUSED: 2918 if (avail >= runtime->control->avail_min) { 2919 mask = POLLOUT | POLLWRNORM; 2920 break; 2921 } 2922 /* Fall through */ 2923 case SNDRV_PCM_STATE_DRAINING: 2924 mask = 0; 2925 break; 2926 default: 2927 mask = POLLOUT | POLLWRNORM | POLLERR; 2928 break; 2929 } 2930 snd_pcm_stream_unlock_irq(substream); 2931 return mask; 2932 } 2933 2934 static unsigned int snd_pcm_capture_poll(struct file *file, poll_table * wait) 2935 { 2936 struct snd_pcm_file *pcm_file; 2937 struct snd_pcm_substream *substream; 2938 struct snd_pcm_runtime *runtime; 2939 unsigned int mask; 2940 snd_pcm_uframes_t avail; 2941 2942 pcm_file = file->private_data; 2943 2944 substream = pcm_file->substream; 2945 if (PCM_RUNTIME_CHECK(substream)) 2946 return -ENXIO; 2947 runtime = substream->runtime; 2948 2949 poll_wait(file, &runtime->sleep, wait); 2950 2951 snd_pcm_stream_lock_irq(substream); 2952 avail = snd_pcm_capture_avail(runtime); 2953 switch (runtime->status->state) { 2954 case SNDRV_PCM_STATE_RUNNING: 2955 case SNDRV_PCM_STATE_PREPARED: 2956 case SNDRV_PCM_STATE_PAUSED: 2957 if (avail >= runtime->control->avail_min) { 2958 mask = POLLIN | POLLRDNORM; 2959 break; 2960 } 2961 mask = 0; 2962 break; 2963 case SNDRV_PCM_STATE_DRAINING: 2964 if (avail > 0) { 2965 mask = POLLIN | POLLRDNORM; 2966 break; 2967 } 2968 /* Fall through */ 2969 default: 2970 mask = POLLIN | POLLRDNORM | POLLERR; 2971 break; 2972 } 2973 snd_pcm_stream_unlock_irq(substream); 2974 return mask; 2975 } 2976 2977 /* 2978 * mmap support 2979 */ 2980 2981 /* 2982 * Only on coherent architectures, we can mmap the status and the control records 2983 * for effcient data transfer. On others, we have to use HWSYNC ioctl... 2984 */ 2985 #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_ALPHA) 2986 /* 2987 * mmap status record 2988 */ 2989 static int snd_pcm_mmap_status_fault(struct vm_area_struct *area, 2990 struct vm_fault *vmf) 2991 { 2992 struct snd_pcm_substream *substream = area->vm_private_data; 2993 struct snd_pcm_runtime *runtime; 2994 2995 if (substream == NULL) 2996 return VM_FAULT_SIGBUS; 2997 runtime = substream->runtime; 2998 vmf->page = virt_to_page(runtime->status); 2999 get_page(vmf->page); 3000 return 0; 3001 } 3002 3003 static struct vm_operations_struct snd_pcm_vm_ops_status = 3004 { 3005 .fault = snd_pcm_mmap_status_fault, 3006 }; 3007 3008 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file, 3009 struct vm_area_struct *area) 3010 { 3011 struct snd_pcm_runtime *runtime; 3012 long size; 3013 if (!(area->vm_flags & VM_READ)) 3014 return -EINVAL; 3015 runtime = substream->runtime; 3016 size = area->vm_end - area->vm_start; 3017 if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status))) 3018 return -EINVAL; 3019 area->vm_ops = &snd_pcm_vm_ops_status; 3020 area->vm_private_data = substream; 3021 area->vm_flags |= VM_RESERVED; 3022 return 0; 3023 } 3024 3025 /* 3026 * mmap control record 3027 */ 3028 static int snd_pcm_mmap_control_fault(struct vm_area_struct *area, 3029 struct vm_fault *vmf) 3030 { 3031 struct snd_pcm_substream *substream = area->vm_private_data; 3032 struct snd_pcm_runtime *runtime; 3033 3034 if (substream == NULL) 3035 return VM_FAULT_SIGBUS; 3036 runtime = substream->runtime; 3037 vmf->page = virt_to_page(runtime->control); 3038 get_page(vmf->page); 3039 return 0; 3040 } 3041 3042 static struct vm_operations_struct snd_pcm_vm_ops_control = 3043 { 3044 .fault = snd_pcm_mmap_control_fault, 3045 }; 3046 3047 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file, 3048 struct vm_area_struct *area) 3049 { 3050 struct snd_pcm_runtime *runtime; 3051 long size; 3052 if (!(area->vm_flags & VM_READ)) 3053 return -EINVAL; 3054 runtime = substream->runtime; 3055 size = area->vm_end - area->vm_start; 3056 if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control))) 3057 return -EINVAL; 3058 area->vm_ops = &snd_pcm_vm_ops_control; 3059 area->vm_private_data = substream; 3060 area->vm_flags |= VM_RESERVED; 3061 return 0; 3062 } 3063 #else /* ! coherent mmap */ 3064 /* 3065 * don't support mmap for status and control records. 3066 */ 3067 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file, 3068 struct vm_area_struct *area) 3069 { 3070 return -ENXIO; 3071 } 3072 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file, 3073 struct vm_area_struct *area) 3074 { 3075 return -ENXIO; 3076 } 3077 #endif /* coherent mmap */ 3078 3079 /* 3080 * fault callback for mmapping a RAM page 3081 */ 3082 static int snd_pcm_mmap_data_fault(struct vm_area_struct *area, 3083 struct vm_fault *vmf) 3084 { 3085 struct snd_pcm_substream *substream = area->vm_private_data; 3086 struct snd_pcm_runtime *runtime; 3087 unsigned long offset; 3088 struct page * page; 3089 void *vaddr; 3090 size_t dma_bytes; 3091 3092 if (substream == NULL) 3093 return VM_FAULT_SIGBUS; 3094 runtime = substream->runtime; 3095 offset = vmf->pgoff << PAGE_SHIFT; 3096 dma_bytes = PAGE_ALIGN(runtime->dma_bytes); 3097 if (offset > dma_bytes - PAGE_SIZE) 3098 return VM_FAULT_SIGBUS; 3099 if (substream->ops->page) { 3100 page = substream->ops->page(substream, offset); 3101 if (!page) 3102 return VM_FAULT_SIGBUS; 3103 } else { 3104 vaddr = runtime->dma_area + offset; 3105 page = virt_to_page(vaddr); 3106 } 3107 get_page(page); 3108 vmf->page = page; 3109 return 0; 3110 } 3111 3112 static struct vm_operations_struct snd_pcm_vm_ops_data = 3113 { 3114 .open = snd_pcm_mmap_data_open, 3115 .close = snd_pcm_mmap_data_close, 3116 .fault = snd_pcm_mmap_data_fault, 3117 }; 3118 3119 /* 3120 * mmap the DMA buffer on RAM 3121 */ 3122 static int snd_pcm_default_mmap(struct snd_pcm_substream *substream, 3123 struct vm_area_struct *area) 3124 { 3125 area->vm_ops = &snd_pcm_vm_ops_data; 3126 area->vm_private_data = substream; 3127 area->vm_flags |= VM_RESERVED; 3128 atomic_inc(&substream->mmap_count); 3129 return 0; 3130 } 3131 3132 /* 3133 * mmap the DMA buffer on I/O memory area 3134 */ 3135 #if SNDRV_PCM_INFO_MMAP_IOMEM 3136 static struct vm_operations_struct snd_pcm_vm_ops_data_mmio = 3137 { 3138 .open = snd_pcm_mmap_data_open, 3139 .close = snd_pcm_mmap_data_close, 3140 }; 3141 3142 int snd_pcm_lib_mmap_iomem(struct snd_pcm_substream *substream, 3143 struct vm_area_struct *area) 3144 { 3145 long size; 3146 unsigned long offset; 3147 3148 #ifdef pgprot_noncached 3149 area->vm_page_prot = pgprot_noncached(area->vm_page_prot); 3150 #endif 3151 area->vm_ops = &snd_pcm_vm_ops_data_mmio; 3152 area->vm_private_data = substream; 3153 area->vm_flags |= VM_IO; 3154 size = area->vm_end - area->vm_start; 3155 offset = area->vm_pgoff << PAGE_SHIFT; 3156 if (io_remap_pfn_range(area, area->vm_start, 3157 (substream->runtime->dma_addr + offset) >> PAGE_SHIFT, 3158 size, area->vm_page_prot)) 3159 return -EAGAIN; 3160 atomic_inc(&substream->mmap_count); 3161 return 0; 3162 } 3163 3164 EXPORT_SYMBOL(snd_pcm_lib_mmap_iomem); 3165 #endif /* SNDRV_PCM_INFO_MMAP */ 3166 3167 /* 3168 * mmap DMA buffer 3169 */ 3170 int snd_pcm_mmap_data(struct snd_pcm_substream *substream, struct file *file, 3171 struct vm_area_struct *area) 3172 { 3173 struct snd_pcm_runtime *runtime; 3174 long size; 3175 unsigned long offset; 3176 size_t dma_bytes; 3177 3178 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { 3179 if (!(area->vm_flags & (VM_WRITE|VM_READ))) 3180 return -EINVAL; 3181 } else { 3182 if (!(area->vm_flags & VM_READ)) 3183 return -EINVAL; 3184 } 3185 runtime = substream->runtime; 3186 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 3187 return -EBADFD; 3188 if (!(runtime->info & SNDRV_PCM_INFO_MMAP)) 3189 return -ENXIO; 3190 if (runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED || 3191 runtime->access == SNDRV_PCM_ACCESS_RW_NONINTERLEAVED) 3192 return -EINVAL; 3193 size = area->vm_end - area->vm_start; 3194 offset = area->vm_pgoff << PAGE_SHIFT; 3195 dma_bytes = PAGE_ALIGN(runtime->dma_bytes); 3196 if ((size_t)size > dma_bytes) 3197 return -EINVAL; 3198 if (offset > dma_bytes - size) 3199 return -EINVAL; 3200 3201 if (substream->ops->mmap) 3202 return substream->ops->mmap(substream, area); 3203 else 3204 return snd_pcm_default_mmap(substream, area); 3205 } 3206 3207 EXPORT_SYMBOL(snd_pcm_mmap_data); 3208 3209 static int snd_pcm_mmap(struct file *file, struct vm_area_struct *area) 3210 { 3211 struct snd_pcm_file * pcm_file; 3212 struct snd_pcm_substream *substream; 3213 unsigned long offset; 3214 3215 pcm_file = file->private_data; 3216 substream = pcm_file->substream; 3217 if (PCM_RUNTIME_CHECK(substream)) 3218 return -ENXIO; 3219 3220 offset = area->vm_pgoff << PAGE_SHIFT; 3221 switch (offset) { 3222 case SNDRV_PCM_MMAP_OFFSET_STATUS: 3223 if (pcm_file->no_compat_mmap) 3224 return -ENXIO; 3225 return snd_pcm_mmap_status(substream, file, area); 3226 case SNDRV_PCM_MMAP_OFFSET_CONTROL: 3227 if (pcm_file->no_compat_mmap) 3228 return -ENXIO; 3229 return snd_pcm_mmap_control(substream, file, area); 3230 default: 3231 return snd_pcm_mmap_data(substream, file, area); 3232 } 3233 return 0; 3234 } 3235 3236 static int snd_pcm_fasync(int fd, struct file * file, int on) 3237 { 3238 struct snd_pcm_file * pcm_file; 3239 struct snd_pcm_substream *substream; 3240 struct snd_pcm_runtime *runtime; 3241 int err = -ENXIO; 3242 3243 lock_kernel(); 3244 pcm_file = file->private_data; 3245 substream = pcm_file->substream; 3246 if (PCM_RUNTIME_CHECK(substream)) 3247 goto out; 3248 runtime = substream->runtime; 3249 err = fasync_helper(fd, file, on, &runtime->fasync); 3250 out: 3251 unlock_kernel(); 3252 return err; 3253 } 3254 3255 /* 3256 * ioctl32 compat 3257 */ 3258 #ifdef CONFIG_COMPAT 3259 #include "pcm_compat.c" 3260 #else 3261 #define snd_pcm_ioctl_compat NULL 3262 #endif 3263 3264 /* 3265 * To be removed helpers to keep binary compatibility 3266 */ 3267 3268 #ifdef CONFIG_SND_SUPPORT_OLD_API 3269 #define __OLD_TO_NEW_MASK(x) ((x&7)|((x&0x07fffff8)<<5)) 3270 #define __NEW_TO_OLD_MASK(x) ((x&7)|((x&0xffffff00)>>5)) 3271 3272 static void snd_pcm_hw_convert_from_old_params(struct snd_pcm_hw_params *params, 3273 struct snd_pcm_hw_params_old *oparams) 3274 { 3275 unsigned int i; 3276 3277 memset(params, 0, sizeof(*params)); 3278 params->flags = oparams->flags; 3279 for (i = 0; i < ARRAY_SIZE(oparams->masks); i++) 3280 params->masks[i].bits[0] = oparams->masks[i]; 3281 memcpy(params->intervals, oparams->intervals, sizeof(oparams->intervals)); 3282 params->rmask = __OLD_TO_NEW_MASK(oparams->rmask); 3283 params->cmask = __OLD_TO_NEW_MASK(oparams->cmask); 3284 params->info = oparams->info; 3285 params->msbits = oparams->msbits; 3286 params->rate_num = oparams->rate_num; 3287 params->rate_den = oparams->rate_den; 3288 params->fifo_size = oparams->fifo_size; 3289 } 3290 3291 static void snd_pcm_hw_convert_to_old_params(struct snd_pcm_hw_params_old *oparams, 3292 struct snd_pcm_hw_params *params) 3293 { 3294 unsigned int i; 3295 3296 memset(oparams, 0, sizeof(*oparams)); 3297 oparams->flags = params->flags; 3298 for (i = 0; i < ARRAY_SIZE(oparams->masks); i++) 3299 oparams->masks[i] = params->masks[i].bits[0]; 3300 memcpy(oparams->intervals, params->intervals, sizeof(oparams->intervals)); 3301 oparams->rmask = __NEW_TO_OLD_MASK(params->rmask); 3302 oparams->cmask = __NEW_TO_OLD_MASK(params->cmask); 3303 oparams->info = params->info; 3304 oparams->msbits = params->msbits; 3305 oparams->rate_num = params->rate_num; 3306 oparams->rate_den = params->rate_den; 3307 oparams->fifo_size = params->fifo_size; 3308 } 3309 3310 static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream, 3311 struct snd_pcm_hw_params_old __user * _oparams) 3312 { 3313 struct snd_pcm_hw_params *params; 3314 struct snd_pcm_hw_params_old *oparams = NULL; 3315 int err; 3316 3317 params = kmalloc(sizeof(*params), GFP_KERNEL); 3318 if (!params) 3319 return -ENOMEM; 3320 3321 oparams = memdup_user(_oparams, sizeof(*oparams)); 3322 if (IS_ERR(oparams)) { 3323 err = PTR_ERR(oparams); 3324 goto out; 3325 } 3326 snd_pcm_hw_convert_from_old_params(params, oparams); 3327 err = snd_pcm_hw_refine(substream, params); 3328 snd_pcm_hw_convert_to_old_params(oparams, params); 3329 if (copy_to_user(_oparams, oparams, sizeof(*oparams))) { 3330 if (!err) 3331 err = -EFAULT; 3332 } 3333 3334 kfree(oparams); 3335 out: 3336 kfree(params); 3337 return err; 3338 } 3339 3340 static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream, 3341 struct snd_pcm_hw_params_old __user * _oparams) 3342 { 3343 struct snd_pcm_hw_params *params; 3344 struct snd_pcm_hw_params_old *oparams = NULL; 3345 int err; 3346 3347 params = kmalloc(sizeof(*params), GFP_KERNEL); 3348 if (!params) 3349 return -ENOMEM; 3350 3351 oparams = memdup_user(_oparams, sizeof(*oparams)); 3352 if (IS_ERR(oparams)) { 3353 err = PTR_ERR(oparams); 3354 goto out; 3355 } 3356 snd_pcm_hw_convert_from_old_params(params, oparams); 3357 err = snd_pcm_hw_params(substream, params); 3358 snd_pcm_hw_convert_to_old_params(oparams, params); 3359 if (copy_to_user(_oparams, oparams, sizeof(*oparams))) { 3360 if (!err) 3361 err = -EFAULT; 3362 } 3363 3364 kfree(oparams); 3365 out: 3366 kfree(params); 3367 return err; 3368 } 3369 #endif /* CONFIG_SND_SUPPORT_OLD_API */ 3370 3371 #ifndef CONFIG_MMU 3372 unsigned long dummy_get_unmapped_area(struct file *file, unsigned long addr, 3373 unsigned long len, unsigned long pgoff, 3374 unsigned long flags) 3375 { 3376 return 0; 3377 } 3378 #else 3379 # define dummy_get_unmapped_area NULL 3380 #endif 3381 3382 /* 3383 * Register section 3384 */ 3385 3386 const struct file_operations snd_pcm_f_ops[2] = { 3387 { 3388 .owner = THIS_MODULE, 3389 .write = snd_pcm_write, 3390 .aio_write = snd_pcm_aio_write, 3391 .open = snd_pcm_playback_open, 3392 .release = snd_pcm_release, 3393 .poll = snd_pcm_playback_poll, 3394 .unlocked_ioctl = snd_pcm_playback_ioctl, 3395 .compat_ioctl = snd_pcm_ioctl_compat, 3396 .mmap = snd_pcm_mmap, 3397 .fasync = snd_pcm_fasync, 3398 .get_unmapped_area = dummy_get_unmapped_area, 3399 }, 3400 { 3401 .owner = THIS_MODULE, 3402 .read = snd_pcm_read, 3403 .aio_read = snd_pcm_aio_read, 3404 .open = snd_pcm_capture_open, 3405 .release = snd_pcm_release, 3406 .poll = snd_pcm_capture_poll, 3407 .unlocked_ioctl = snd_pcm_capture_ioctl, 3408 .compat_ioctl = snd_pcm_ioctl_compat, 3409 .mmap = snd_pcm_mmap, 3410 .fasync = snd_pcm_fasync, 3411 .get_unmapped_area = dummy_get_unmapped_area, 3412 } 3413 }; 3414